What Happens During an IVF Cycle? A Step-by-Step Guide

What Happens During an IVF Cycle? A Step-by-Step Guide

Fertility

If you or someone you love is exploring in vitro fertilisation (IVF), it's completely natural to feel a mix of hope and uncertainty. One of the most common concerns patients share with our fertility specialists is simply this: "I don't know what to expect." Understanding the IVF process, step by step, can help reduce anxiety, support informed decision-making, and prepare you emotionally and physically for the journey ahead. This guide breaks down exactly what happens during an IVF cycle, using clear, medically accurate information designed for patients at every stage of their fertility journey.

What Is IVF and Who Is It For?

In vitro fertilisation (IVF) is an assisted reproductive technology (ART) in which eggs are fertilised by sperm outside the body in a laboratory setting. The resulting embryo is then transferred into the uterus to establish a pregnancy.

According to the World Health Organization (WHO), approximately 1 in 6 people of reproductive age worldwide experience infertility. IVF is one of the most effective fertility solutions available today.

IVF may be recommended for individuals or couples dealing with:

  • Blocked or damaged fallopian tubes

  • Male factor infertility (low sperm count or motility)

  • Polycystic ovary syndrome (PCOS) or ovulatory disorders

  • Endometriosis

  • Unexplained infertility

  • Recurrent pregnancy loss

  • Age-related decline in fertility

Before recommending IVF, your fertility specialist will conduct a thorough evaluation, including hormonal blood tests, ultrasound scans, semen analysis, and a review of your medical history.

The IVF Cycle: A Step-by-Step Breakdown

A standard IVF cycle typically spans 2 to 6 weeks, depending on the protocol used and your individual response to treatment. Here is what each stage involves.

Step 1: Initial Consultation and Fertility Assessment

Your IVF journey begins with a comprehensive consultation with a reproductive endocrinologist or fertility specialist. This includes:

  • Review of medical history and previous treatments

  • Hormonal testing (FSH, LH, AMH, estradiol) to assess ovarian reserve

  • Transvaginal ultrasound to evaluate the uterus and ovaries

  • Semen analysis for male partners

  • Genetic screening if clinically indicated

This assessment helps personalise your treatment protocol and sets realistic expectations. Visit our Fertility and IVF Services page to learn more about our diagnostic approach.

Step 2: Ovarian Stimulation

Normally, your body produces one egg per menstrual cycle. During IVF, injectable hormonal medications (gonadotrophins) are used to stimulate your ovaries to produce multiple eggs, increasing the chances of obtaining viable embryos.

This phase typically lasts 8 to 14 days. During this time, you will attend regular monitoring appointments, including:

  • Blood tests to check hormone levels

  • Transvaginal ultrasounds to track follicle development

Your medication dosage may be adjusted based on your body's response. According to the NHS, close monitoring during stimulation is essential to minimise the risk of ovarian hyperstimulation syndrome (OHSS), a potential side effect of fertility medications.

Step 3: Trigger Injection and Egg Retrieval

Once the follicles reach an optimal size (typically 18–20 mm), a trigger injection (hCG or GnRH agonist) is administered to finalise egg maturation. Egg retrieval is scheduled approximately 34 to 36 hours after the trigger shot.

Egg retrieval (oocyte pick-up) is a minor surgical procedure performed under light sedation or anaesthesia. Using ultrasound guidance, a thin needle is passed through the vaginal wall to aspirate fluid from the follicles and collect the eggs.

The procedure usually takes 20 to 30 minutes. Most patients experience mild cramping or bloating afterward and can return home the same day.

Step 4: Sperm Collection and Fertilisation

On the day of egg retrieval, a semen sample is collected from the male partner (or a donor, if applicable). The sample is processed in the laboratory to isolate the healthiest, most motile sperm.

Fertilisation can occur through two methods:

  • Conventional IVF: Eggs and sperm are placed together in a culture dish and fertilisation occurs naturally.

  • Intracytoplasmic Sperm Injection (ICSI): A single sperm is directly injected into each egg. This is recommended in cases of male factor infertility or previous fertilisation failure. Learn more about ICSI treatment at our centre.

Fertilisation is confirmed 16–18 hours after the procedure. Successfully fertilised eggs are called zygotes and are cultured in the laboratory for 3 to 5 days.

Step 5: Embryo Development and Grading

Over the next few days, embryologists closely monitor the developing embryos. By Day 3, a healthy embryo typically has 6 to 8 cells. By Day 5 or 6, it reaches the blastocyst stage, the most advanced and preferred stage for transfer, as it correlates with higher implantation rates.

Embryos are graded based on their appearance and development rate. This helps identify the embryo most likely to result in a successful pregnancy. In some cases, preimplantation genetic testing (PGT) may be recommended to screen embryos for chromosomal abnormalities before transfer.

Step 6: Embryo Transfer

Embryo transfer is a simple, usually painless procedure that does not require anaesthesia. A thin, flexible catheter is used to transfer one or more embryos into the uterine cavity under ultrasound guidance.

The number of embryos transferred depends on:

  • Patient age

  • Embryo quality

  • Previous IVF history

  • Clinical guidelines and patient preference

Most clinics today advocate a single embryo transfer (SET) to reduce the risk of multiple pregnancies while maintaining good success rates. Any remaining high-quality embryos can be cryopreserved (frozen) for future use. Explore our embryo freezing and cryopreservation services for more information.

Step 7: The Two-Week Wait and Pregnancy Test

After embryo transfer, patients enter what is commonly known as the "two-week wait"  the period between transfer and the first pregnancy test. This is often the most emotionally challenging part of the IVF cycle.

During this time, progesterone support (via injections, pessaries, or oral tablets) is provided to prepare the uterine lining for implantation.

A blood test (beta-hCG) is performed approximately 12 to 14 days after transfer to determine whether a pregnancy has been achieved. An early ultrasound follows a positive result to confirm a viable pregnancy.

If you're preparing for pregnancy, our Maternity and Antenatal Care team is here to support you every step of the way.

Factors That Affect IVF Success Rates

It is important to approach IVF with realistic expectations. According to ICMR guidelines on ART, success rates vary based on multiple factors, including:

  • Age — Women under 35 generally have higher success rates

  • Ovarian reserve (AMH levels and antral follicle count)

  • Embryo quality

  • Uterine health

  • Lifestyle factors — Smoking, alcohol, BMI, and stress levels

  • Underlying medical conditions such as endometriosis or PCOS

No fertility clinic can guarantee a successful outcome, and any centre claiming a "100% success rate" should be approached with caution. What a good clinic can offer is evidence-based care, transparent communication, and compassionate support throughout.

Lifestyle Tips to Support Your Fertility Treatment

Small but meaningful lifestyle adjustments can improve your body's readiness for IVF:

  • Maintain a healthy BMI — Both underweight and overweight conditions can affect egg quality and implantation

  • Eat a balanced, nutrient-rich diet with antioxidants, folate, and omega-3 fatty acids

  • Limit caffeine and avoid alcohol and tobacco entirely during treatment

  • Manage stress through yoga, meditation, counselling, or light exercise

  • Take prescribed supplements such as folic acid and Vitamin D as advised by your doctor

  • Sleep well — Poor sleep affects hormonal health significantly

When Should You See a Fertility Specialist?

You should consider consulting a fertility specialist or gynaecologist if:

  • You have been trying to conceive for 12 months (or 6 months if over 35) without success

  • You have irregular or absent periods

  • You have a known condition such as PCOS, endometriosis, or fibroids

  • Your partner has a history of low sperm count or previous fertility issues

  • You have experienced recurrent miscarriages

Early evaluation leads to earlier intervention and better outcomes. Book a consultation with our Gynaecology and Reproductive Health team today.

Frequently Asked Questions (FAQs)

Q1. Is the IVF process painful?

 Most patients find IVF manageable. Injections may cause mild discomfort, and egg retrieval is done under sedation. Some bloating or cramping after retrieval is common but temporary.

Q2. How many IVF cycles might I need? 

This varies greatly depending on individual factors. Some patients conceive in the first cycle; others may need two or three cycles. Your doctor will discuss realistic expectations based on your specific profile.

Q3. What is the difference between IVF and ICSI?

 In conventional IVF, eggs and sperm fertilise naturally in a dish. In ICSI (Intracytoplasmic Sperm Injection), a single sperm is injected directly into an egg. ICSI is typically recommended for male factor infertility or previous fertilisation failure.

Q4. Can I work during an IVF cycle?

 Most women continue working during IVF. However, the monitoring appointments and emotional demands may require some flexibility. Discuss your schedule with your fertility team.

Q5. What happens to unused embryos? 

High-quality unused embryos can be frozen (cryopreserved) for future cycles. This avoids the need to repeat stimulation and retrieval, making future attempts less invasive and more cost-effective.

Q6. Does IVF increase the risk of birth defects? 

According to the CDC, babies born through IVF are generally healthy. There is a slightly higher statistical association with certain conditions, largely related to underlying parental factors rather than the procedure itself. Your specialist will discuss any specific risks relevant to your case.

Medical Disclaimer

The information provided in this article is intended for general educational purposes only and does not constitute medical advice. Every patient's fertility journey is unique. Please consult a qualified fertility specialist or gynaecologist before making any decisions about your treatment. Do not delay seeking professional medical advice based on information read online.

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