What does an IVF cycle involve, step by step?
The short answer
Stimulation, monitoring, trigger, retrieval, fertilization, embryo development and transfer — with a wait at each step. Protocols vary a lot, so the shape matters more than exact days.
What to know
- Stimulation runs roughly 8 to 14 days with frequent monitoring visits. Plan for the time off.
- The trigger shot is timed precisely; retrieval follows about 36 hours later.
- Not every egg fertilizes and not every embryo develops. Attrition at each stage is normal.
- Fresh and frozen transfer are both normal routes, chosen for different reasons.
- Ask what your specific protocol is and how many monitoring visits to expect.
What you can do now
- Know the warning signs of OHSS. Rapid weight gain, a very swollen belly, or shortness of breath — call your clinic straight away.
- Ask about exercise limits during stimulation. Your ovaries are enlarged, so clinics often advise avoiding high-impact exercise.
- Strong evidence Keep taking your prenatal.
Read the full explanation
Here's the sequence, with the words you'll hear at each step.
1. Preparation
Baseline bloodwork and ultrasound, and sometimes birth control pills or other medication to line up the cycle. Some protocols start with a suppression medication.
2. Stimulation ("stims")
Daily injectable hormones for roughly 8 to 14 days to grow multiple follicles at once. Monitoring visits every few days measure follicle size by ultrasound and estradiol by blood test. A second medication is added partway through to prevent early ovulation.
3. Trigger
When follicles reach the target size, a timed "trigger" injection matures the eggs. Retrieval is scheduled about 36 hours later. The timing matters to the hour.
4. Egg retrieval
A short procedure under sedation; a needle guided by ultrasound collects eggs from each follicle. You'll hear the number retrieved that day, and the number that were mature.
5. Fertilization
Eggs are fertilized in the lab, either conventionally or by ICSI (one sperm injected into each egg). The next day you'll hear how many fertilized.
6. Embryo culture
Embryos grow for five to six days to the blastocyst stage. Updates on day 3 and day 5 or 6 tell you how many are progressing and their grades. Not every fertilized egg becomes a blastocyst; a drop in numbers is expected.
7. PGT-A (optional)
A few cells are biopsied from each blastocyst and tested for chromosome number. Embryos are frozen while waiting for results.
8. Transfer
Either fresh (a few days after retrieval) or frozen (a later cycle, after preparing the uterine lining with medication). A single embryo is placed in the uterus through a thin catheter; no sedation is needed.
9. The wait and the beta
About 9 to 14 days after transfer, a blood test (beta hCG) checks for pregnancy. It's usually repeated 48 hours later to see whether the number is rising as expected.
What the research shows
Not rated, deliberately. This page explains how something works rather than claiming a treatment helps, so a rating would mean nothing. Everything traces to the sources below.
Questions for your doctor
Edit any of these before you add it — they're yours. Your list stays in this browser, and you can print a one-page sheet from it.
- What does my protocol involve, and how many monitoring visits should I plan for?
- What would make you cancel or change a cycle partway through?