IVF stimulation is roughly a 10‑day period during which you self‑administer injections and attend regular ultrasound check‑ups. The goal is to increase the number of maturing eggs suitable for fertilisation. For many women, it’s a new experience filled with questions, expectations, and concerns. In this article, we clearly explain how IVF stimulation works, what is normal, and what changes you may notice during this period.
The Essentials of IVF Stimulation
IVF stimulation is a hormonal treatment that usually lasts 8 – 12 days, with the aim of supporting the maturation of multiple eggs in one cycle.
In practice, this means that:
- you administer daily hormonal injections (usually subcutaneously),
- you attend regular ultrasound check-ups, sometimes also blood tests,
- your doctor continuously monitors you and adjusts the treatment according to your body’s response.
Below, we explain in detail how IVF stimulation works, what to expect, and why it is so important.
Why Is Hormonal Stimulation Needed?
In a natural menstrual cycle, typically only one egg matures. For IVF, however, doctors need to retrieve multiple eggs at once — ideally 8 to 15. The more quality eggs embryologists have, the higher the chance of creating healthy embryos suitable for transfer.
IVF stimulation therefore uses hormones to support the growth of multiple follicles (fluid-filled sacs containing eggs). It is a standard and essential part of any IVF cycle using your own eggs.
How Does IVF Stimulation Work?
Stimulation usually begins on day 1 of your menstrual cycle — the day of full bleeding (light spotting does not count). If your period starts after 8 p.m., the following day counts as day 1.
Although your protocol is personalised by your doctor, the general process is similar.
The entire stimulation phase typically lasts 8 – 12 days, most often around 10. The exact length depends on how quickly your follicles mature, which is monitored via ultrasound.
How Do the Medications Work?
Hormonal medications are administered as subcutaneous injections, similar to insulin for diabetics. A nurse shows you the first injection, and from day 2 most women continue on their own at home.
It’s neither as complicated nor as painful as it may seem. Modern medications come in pen injectors, which simplify dosing and use. You inject into subcutaneous fat — usually the abdomen or thigh. Your protocol tells you exactly when and how much to inject.
Regular Check-Ups
During stimulation you undergo 2 – 3 ultrasound examinations monitoring:
- number and size of follicles,
- ovarian response,
- uterine lining thickness.
In some cases, blood tests are also taken. The first check-up usually occurs around day 8 or 9. Based on follicle size, your doctor decides whether everything is progressing well or needs adjusting.
Tip: Read also which supplements are recommended while preparing for IVF.
What Might You Feel During IVF Stimulation?
Every body reacts differently. Many women say the sensations are similar to stronger PMS symptoms. Toward the end, you may feel pressure or mild tension in the lower abdomen — the ovaries enlarge as multiple follicles grow.
Common side effects include bloating, breast tenderness, mild fatigue, headaches, or mood swings. These are temporary and usually disappear shortly after egg retrieval. Some women feel almost nothing.
When Should You Contact a Doctor?
Although most women go through stimulation without complications, you should immediately contact your clinic if you experience:
- severe abdominal pain, especially with nausea or vomiting,
- significant bloating and breathing difficulties,
- sudden abdominal enlargement,
- unusually dark urine.
These symptoms may indicate ovarian hyperstimulation syndrome (OHSS). Thanks to careful dosing and monitoring, it occurs only in a small percentage of cases today.
After Stimulation Comes Egg Retrieval
When follicles reach the appropriate size (usually 18 – 20 mm), you administer the final trigger injection to complete egg maturation. Around 24 – 36 hours later, the eggs are retrieved under short general anaesthesia.
Most side effects quickly subside afterward. Your body returns to normal, and you move on to the next phase — fertilisation and preparation for embryo transfer.
Timeline of the IVF Stimulation Process.
Practical Tips to Handle IVF Stimulation
You don’t need to drastically change your routine, but a few adjustments may help:
- Take things at a slower pace — avoid intense exercise.
- Drink plenty of fluids, preferably water.
- Eat light and balanced meals.
- Don’t hesitate to ask questions — especially about dosing.
- Listen to your body; fatigue is a signal to rest.
- Communicate openly with your partner — especially useful during mood changes.
Let Go of Unnecessary Worries
IVF stimulation may be uncomfortable at times, but it is not as bad as often described. Most women manage it well and focus on the next steps in their journey. What matters is following medical instructions, attending check-ups, and asking about anything unclear.
If you’re considering IVF, reach out to us. During the 10-day stimulation period, we monitor you carefully, adjusting everything according to your test results and needs. Our team guides you through the process and supports you throughout.
