IVF Processing Step by Step: Full Timeline

You are days or weeks away from your first cycle, and someone has handed you a calendar covered in abbreviations. BCP, antagonist, trigger, ET. You are trying to map the next six to eight weeks of your life onto a piece of paper that uses words you have not been taught yet. This is the IVF processing map I would draw on the back of that calendar if we were sitting in clinic together.

I want to say one thing plainly before any clinical content. IVF is the most invasive treatment most people will ever do for their fertility. It is also the most decision-dense. Every step branches, and at every branch your doctor will ask you to choose between options that sound similar but are not. The single best thing a first-cycle reader can do to lower their anxiety is to read the whole timeline before it starts. Not because reading replaces care, but because the calendar stops ambushing you when you know what is coming.

This is the spine post for our IVF library. Every step you see here links out to a deeper post on that step. Read this one first so the rest sits in order.

What is IVF, in plain language?

IVF, in vitro fertilization, is not one procedure. It is a sequence of seven decisions stacked on top of each other:

1. Ovarian stimulation: you take injectable hormones (gonadotropins, which are FSH or FSH plus LH) to grow multiple follicles in one cycle instead of the single follicle a natural cycle would produce.
2. Egg retrieval: under ultrasound guidance and IV sedation, the eggs are collected from the ovaries through a thin needle that passes through the vaginal wall. Fifteen to twenty minutes in the room.
3. Fertilization: eggs and sperm meet in the embryology lab, either by conventional insemination (sperm placed with eggs in a dish) or by ICSI (intracytoplasmic sperm injection, one sperm injected into one egg).
4. Embryo culture: fertilized eggs are watched for three to seven days. Day 3 is the cleavage stage. Days 5 to 7 are the blastocyst stage.
5. PGT (optional): preimplantation genetic testing on a tiny biopsy from the embryo, to check chromosome count (PGT-A) or specific gene conditions (PGT-M, PGT-SR).
6. Embryo transfer: one embryo (usually) is placed back into the uterus through a soft catheter. Five-minute procedure. No sedation needed.
7. Luteal support and beta hCG: vaginal or intramuscular progesterone is taken to support the uterine lining, and a pregnancy test is drawn nine to twelve days after transfer.

That is the IVF process. Every word in your nurse coordinator's calendar maps onto one of those seven steps.

What is the IVF timeline, week by week?

I tell my patients to plan for a six-to-eight-week window if they are doing a fresh transfer, and a ten-to-fourteen-week window if they are doing a freeze-all followed by frozen embryo transfer (FET). The difference matters for work, travel, and the conversation you may need to have with your manager.

Pre-cycle (week minus 2 to week 0)

Before injections begin, your clinic will complete:

• Baseline ultrasound to check the ovaries are quiet and the lining is thin.
• AMH (anti-Müllerian hormone), FSH, and antral follicle count (AFC): these three numbers together predict how many eggs you may grow.
• Infectious disease panel: required by the FDA for any IVF cycle in the US.
• Partner semen analysis: fresh or from a recent prior workup.
• Mock embryo transfer: your doctor passes a soft catheter through the cervix into the uterus and measures the geometry so the real transfer is fast and atraumatic¹.
• Consent signing: for the cycle, for cryopreservation, for embryo disposition. Read these. They include questions about what happens to embryos if you separate, die, or stop treatment. They are not pleasant. They are necessary.
• Pharmacy: the meds are usually shipped overnight from a specialty pharmacy. Plan for delivery seven to ten business days before start.

Some protocols add birth control pre-treatment for two to four weeks before stimulation. The purpose is to synchronize follicle development at the start of the cycle, not contraception. If you are on a long Lupron protocol, suppression with the agonist begins in the luteal phase of the prior cycle.

Week 1 (cycle days 1 to 5)

Day 1 of your period is cycle day 1. You call the clinic. They schedule a baseline scan on cycle day 2 or 3. If the scan is clean, you start your gonadotropin injections that night or the next morning. Common brand names you will hear: Gonal-F, Follistim, Menopur, Rekovelle. These are subcutaneous (under the skin), not intramuscular. Usually injected in the lower belly. The first time you do it, you will be nervous. By night four, it is a brushing-teeth-level task.

Week 2 (cycle days 6 to 12)

Now the work starts. You will visit the clinic every two to three days, sometimes daily by the end, for monitoring scans and estradiol bloodwork. The scan counts follicles and measures their size. Estradiol (E2) trends tell your doctor how hard the ovaries are working. Around cycle day 5 to 7, an antagonist medication (Cetrotide or Ganirelix) is added to prevent your body from triggering ovulation on its own before the eggs are mature. In a long agonist protocol, suppression was already on board from before.

Your doses may change every visit. This is normal: IVF is responsive medicine, not a static recipe.

Trigger night (cycle day 9 to 14)

When two or three of the lead follicles reach 17 to 20 mm, your doctor calls the trigger. This is one injection given at a precise time, usually late evening. It can be hCG (Ovidrel, Pregnyl), a GnRH agonist (Lupron), or a dual trigger of both. The trigger primes the eggs for final maturation. Retrieval is scheduled exactly 36 hours later. If your trigger is at 9:30 pm Tuesday, your retrieval is at 9:30 am Thursday. The minute matters.

Retrieval day

You arrive fasting. IV sedation, fifteen to twenty minutes in the room, sixty to ninety minutes total at the clinic. The embryologist immediately counts how many eggs were collected. You will be told that number before you leave. You will be sore and bloated for two to five days. Mild spotting is normal. Severe pain, rapid weight gain, or shortness of breath is not. Call the clinic.

Days 1 to 7 after retrieval (the lab week)

You will get an embryology call most days:

• Day 1: fertilization check. How many eggs fertilized normally: this is the 2PN number (two pronuclei, the sign of correct fertilization).
• Day 3: cleavage stage update. A "good" day 3 embryo has 6 to 10 cells with low fragmentation.
• Days 5 to 7: blastocyst formation. Blasts are graded (the Gardner system: a number for expansion, then two letters for inner cell mass and trophectoderm). Embryos that reach blastocyst are either transferred fresh, frozen for later, or biopsied for PGT and frozen pending results.

In a fresh-transfer cycle, your transfer is day 3 or day 5 post-retrieval. In a freeze-all cycle, every blastocyst that reaches grade is frozen, and the transfer happens in a later cycle.

Fresh transfer or freeze-all

You may not know which one you are doing until trigger night. Reasons to convert to freeze-all on the fly: estradiol very high, more than 20 follicles, OHSS (ovarian hyperstimulation syndrome) risk, progesterone elevated on trigger day, endometrial lining suboptimal, PGT planned. We will come back to fresh vs frozen below.

Two-week wait and beta hCG

After transfer, you will be on progesterone by vaginal suppository, intramuscular injection, or both. The luteal phase support continues through your beta hCG, which is drawn nine to twelve days post-transfer². If the beta is positive, support continues until around week 10 of pregnancy. If it is negative, support stops and a period follows within a week.

What are the five IVF stim protocols you will hear named?

Your RE (reproductive endocrinologist) picks a stim protocol based on your AMH, your AFC, your age, your diagnosis, and your response history if you have done a prior cycle. I will not cover all of that here; we have a separate post on the stim protocols for that. What you need to know going in:

1. Antagonist protocol: the most common protocol in the US today, especially for PCOS. Shorter, lower OHSS risk, allows agonist trigger if needed³.
2. Long agonist (Lupron) protocol: suppression begins in the prior luteal phase. Older, very reliable, used selectively today.
3. Microdose flare: for poor responders. Low-dose agonist used to "flare" the pituitary at cycle start.
4. Mini-IVF / mild stimulation: lower dose, fewer eggs, sometimes oral letrozole with low-dose gonadotropins. Different math entirely.
5. Natural cycle IVF: no stimulation, one egg, one shot. Specific indications, not a default.

When your RE names your protocol, ask why this one for my numbers. The answer should reference your AMH, your AFC, and your age. If it does not, ask again.

What decisions will you be asked to make?

This is where the cycle becomes personal. Each of these gets its own post; here is what you need to know at orientation level.

Fresh transfer or frozen embryo transfer

For most patients with normal response, the data on fresh vs frozen is closer than the marketing suggests. For PCOS, for high responders, and after PGT, freeze-all is now the standard at most US clinics⁴. The freeze-all approach removes the fresh-cycle estrogen surge from the uterine environment, drops OHSS risk, and lets you transfer when your body is calmer. The downside is a longer overall timeline and a second cycle of meds.

In my own practice, I almost always recommend freeze-all in two situations. The first is high response with PCOS, where the OHSS risk is real and the FET data is excellent. The second is when PGT-A is being done, because the biopsy results take seven to fourteen days and the lining will have moved on by then.

Single vs double embryo transfer

The ASRM 2021 guideline strongly prefers elective single embryo transfer (eSET) in patients under 38 with a euploid blastocyst². The reason is not philosophy. The reason is that twins are a high-risk pregnancy: preterm birth rates, NICU admissions, gestational diabetes, preeclampsia all rise sharply. The headline "we transferred two so it would work" turns into a different problem when both implant.

I have this conversation often. The shortcut version: if your embryo is euploid and you are under 38, single transfer is what the evidence supports. Above 38 or after multiple failed transfers, the calculus changes, so talk it through with your team.

PGT-A, yes or no

PGT-A (preimplantation genetic testing for aneuploidy) checks the chromosome count of each blastocyst. It does not improve egg quality. It does help select among the embryos you already have. The STAR trial showed no live-birth advantage in a general IVF population. Where PGT-A may help: advanced maternal age, recurrent loss, multiple failed transfers, a large embryo cohort where you need to choose. Cost is real: three to six thousand dollars platform fee plus per-embryo biopsy. We will get to cost in the next post.

ICSI or conventional insemination

ICSI is one sperm injected into one egg by an embryologist. It is the right call for male factor infertility, prior fertilization failure, very low fertilization in a prior cycle, and most PGT cycles. For unexplained or female-factor IVF with normal semen, conventional insemination performs as well and costs less. Many US clinics default to ICSI on everything; you can ask.

Day 3 transfer or day 5

Day 5 (blastocyst) is now standard at most US clinics. Blastocyst selection means the embryos that get transferred are the ones that survived the harder days, which translates to higher implantation per transfer. Day 3 transfer is used in specific situations: small embryo cohorts, prior poor blastulation, clinic preference.

How much does IVF cost to budget for?

The headline cycle cost in the US in 2024-2025 ranges from roughly USD 15,000 to 25,000 before medications. Meds add USD 3,000 to 7,000. PGT-A adds USD 3,000 to 6,000 plus per-embryo biopsy. A freeze-all plus FET adds USD 3,000 to 6,000 for the FET on top. These are bundle numbers; itemized quotes can look very different. We have a dedicated post on cost that walks through the line items and the "per live birth" math, which is the number that actually matters for planning.

What is normal during the cycle, and what is not?

Most cycles feel like a slow accumulation of pressure. Bloating, breast tenderness, mood swings, mild pelvic ache, headaches from the hormones are all expected. By the end of stimulation, the ovaries are physically larger than normal, and you will feel it.

What is not normal, and what should trigger a phone call to the clinic:

• Sudden abdominal distension or weight gain over two kg in 24 hours.
• Severe abdominal pain that does not respond to acetaminophen.
• Shortness of breath, especially lying down.
• Decreased urine output.
• Nausea and vomiting severe enough to stop fluids.

These are the symptoms of moderate or severe OHSS, which can develop after retrieval, particularly in PCOS or high-AMH patients⁶. Most clinics have an after-hours line. Use it. OHSS is treatable when caught early.

Spotting after retrieval or transfer is usually benign. Document the timing and tell the clinic at your next contact.

What can you do this week?

If you are still in the pre-cycle window:

• Read every consent form before you sign it. The cryopreservation and embryo disposition sections are the ones people regret skimming.
• Walk through the medication video with your partner, not alone. The first injection goes better with a second pair of hands.
• Set the trigger-night alarm on two phones the day you get the time.
• Ask your clinic for the live-birth-per-retrieval rate in your age band, not the per-transfer rate. The per-retrieval number is the honest one.
• Plan five to eight morning monitoring visits over the two weeks of stimulation. Most clinics open at 7 am. Build the rest of your day around that.

If you are mid-cycle:

• Take the injection at the same time every night. Pick a time you can hold for ten to twelve nights.
• Hydrate. Electrolyte drinks are not a fad in this context: they reduce OHSS-related symptoms.
• Limit high-impact exercise once the ovaries are visibly enlarged on scan. Ovarian torsion is rare, but real.

What questions should you ask before your next appointment?

These are the questions that make IVF processing feel less like being a passenger:

• What protocol am I on, and why this one for my AMH, AFC, and age?
• What is your clinic's freeze-all threshold (estradiol level, follicle count)?
• Day 3 or day 5 transfer? Single or double? What does my embryo cohort and my age support?
• How many monitoring visits should I plan for around work?
• What is your live-birth-per-retrieval rate for someone in my age band (not just clinical pregnancy rate)?
• Will I be on agonist trigger or hCG trigger? On what criteria?

What's next

• If you want the calendar in week-by-week detail with time-off-work math, read how long an IVF cycle actually takes.
• If you have PCOS and want the protocol-specific version of this post, read IVF with PCOS.
• If the cost is what you are sitting with, read IVF cost in the US, per cycle, per round, per baby.
• If the cycle is behind you and the transfer did not work, Failed IVF transfer: decoding what's next is where to go.

Related in this cluster

• IVF Success Rates: By Age, Diagnosis, and Cycle Number

Sources

1. Practice Committee of the American Society for Reproductive Medicine. Performing the embryo transfer: a guideline. Fertility and Sterility 2017;107(4):882-896. https://doi.org/10.1016/j.fertnstert.2017.01.025
2. Practice Committee of the American Society for Reproductive Medicine. Guidance on the limits to the number of embryos to transfer: a committee opinion. Fertility and Sterility 2021;116(3):651-654. https://doi.org/10.1016/j.fertnstert.2021.06.050
3. ESHRE Guideline Group on Ovarian Stimulation, Bosch E, et al. ESHRE guideline: ovarian stimulation for IVF/ICSI. Human Reproduction Open 2020;2020(2):hoaa009. https://doi.org/10.1093/hropen/hoaa009
4. Roque M, Haahr T, Geber S, Esteves SC, Humaidan P. Fresh versus elective frozen embryo transfer in IVF/ICSI cycles: a systematic review and meta-analysis of reproductive outcomes. Human Reproduction Update 2019;25(1):2-14. https://doi.org/10.1093/humupd/dmy033
5. Maheshwari A, Pandey S, Amalraj Raja E, et al. Is frozen embryo transfer better for mothers and babies? Can cumulative meta-analysis provide a definitive answer? Human Reproduction Update 2018;24(1):35-58. https://doi.org/10.1093/humupd/dmx031
6. Society for Assisted Reproductive Technology (SART). National Summary Report (CORS), preliminary 2021 data. https://www.sartcorsonline.com/
7. Centers for Disease Control and Prevention (CDC). Assisted Reproductive Technology National Summary Report. https://www.cdc.gov/art/index.html