Understanding IVF phase and Fertilisation; What Affects Pregnancy Chances
Seeing ovulation on a follicular study scan can feel like a big relief. It often is. It means the ovary is growing a follicle and releasing an egg, which is an important part of conception.
But ovulation is only one part of the fertility story.
For pregnancy to happen, the egg and sperm need to meet, fertilise, grow into a healthy embryo, reach the right stage, and then implant in the uterus. During IVF, doctors can observe some of these steps more closely. That makes the IVF phase especially important, as it gives clues about egg quality, sperm quality, fertilisation, and embryo development.
This article is informational and does not replace medical advice. Fertility care should always be personalised with guidance from a qualified doctor or fertility specialist.
What happens during the IVF phase
IVF stands for in vitro fertilisation. In simple terms, it means fertilisation happens outside the body in a laboratory.
A typical IVF cycle includes several steps:
Ovarian stimulation to help multiple eggs grow
Egg retrieval from the ovaries
Collection or preparation of the sperm sample
Fertilisation of eggs with sperm in the lab
Embryo development over the next few days
Embryo transfer into the uterus, if suitable
The fertilisation step is central. It is the moment when sperm enters the egg and the genetic material from both combine. If fertilisation happens successfully, the next question is whether the embryo continues to grow well.
This is why the IVF phase can be emotionally intense. Each update matters, from the number of eggs retrieved to how many fertilise and how embryos develop.
Why fertilisation does not depend on ovulation alone
Regular ovulation is a positive sign. It means the body is releasing an egg, which is necessary for natural conception.
But ovulation alone does not guarantee pregnancy.
A follicular study scan can show that a follicle is growing and likely releasing an egg. It does not always confirm:
Whether the egg is mature and healthy
Whether sperm can reach and fertilise the egg
Whether the fallopian tubes are open
Whether the uterine lining is receptive
Whether hormone balance is supporting implantation
Whether the embryo is developing normally
That is why someone may ovulate regularly and still take time to conceive.
Fertility care looks at the full picture. Doctors may suggest blood tests, semen analysis, tubal evaluation, hormone assessment, ultrasound monitoring, or IVF-related tests based on the couple’s history.
For many women, this broader view brings relief. It shifts the focus from “Why is this not happening if I ovulate?” to “What else can we understand and support?”
Key factors that affect fertilisation and pregnancy chances
Fertilisation is a delicate process. Several factors can influence whether it happens and whether the embryo continues to grow.
Sperm quality matters more than many people realise
Healthy sperm is not just about sperm count.
A semen analysis may look at:
Count
Movement
Shape
Volume
Other markers of sperm health
Sperm needs enough movement to reach the egg in natural conception. In IVF, the lab can help bring sperm and egg together, but sperm quality can still influence fertilisation and embryo development.
Lifestyle factors such as smoking, alcohol intake, poor sleep, high stress, excess heat exposure, and nutritional gaps may affect sperm health. Medical conditions can also play a role.
Egg quality is a major part of the picture
Egg quality refers to the egg’s ability to fertilise and support embryo development.
Age is one factor, but it is not the only one. Hormonal health, inflammation, metabolic health, lifestyle, sleep, and nutrition may also influence the environment in which eggs develop.
Eggs mature over time before ovulation or retrieval. That is why fertility teams often talk about preparation before treatment, not just during treatment.
No food or supplement can “guarantee” better egg quality. Still, a balanced fertility-focused diet may support the body with nutrients needed for hormone function, blood sugar balance, and overall reproductive health.
Embryo development gives important clues
After fertilisation, the embryo starts dividing. In IVF, embryologists observe how embryos grow over the next few days.
Some embryos develop steadily. Some stop growing. This can happen even when egg retrieval and fertilisation seem promising.
Embryo development may be influenced by egg quality, sperm quality, genetics, lab conditions, and other biological factors. This is one reason IVF can feel unpredictable. A good fertility team explains what is happening without blaming the patient.
The uterine environment also matters
Even when a good embryo forms, implantation still has to happen.
The uterus and endometrial lining need to be receptive. Hormones, inflammation, thyroid health, insulin resistance, vitamin deficiencies, and other medical factors may affect this environment.
This is where metabolic health becomes relevant. Blood sugar balance, healthy body composition, gut health, and nutrient status can all support general reproductive wellness.
How lifestyle, nutrition, and metabolic health may support fertility
Fertility is medical, emotional, and lifestyle-related. A supportive routine cannot replace treatment, but it may help the body function better during the journey.
Practical areas to focus on include:
Balanced meals
Aim for meals that combine protein, fibre-rich carbohydrates, healthy fats, and colourful vegetables. This can help support steady energy and blood sugar balance.
Protein at each meal
Dal, pulses, paneer, curd, eggs, fish, chicken, tofu, sprouts, and nuts can help meet daily protein needs, depending on personal food preferences.
Micronutrients
Iron, folate, vitamin D, B vitamins, zinc, selenium, iodine, and omega-3 fats are commonly discussed in fertility care. Testing and supplementation should be guided by a professional.
Blood sugar balance
Frequent sugar spikes may affect hormones and metabolic health, especially in women with insulin resistance or PCOS. Simple swaps, such as pairing fruit with nuts or adding protein to breakfast, can help.
Sleep and stress support
Fertility stress is real. Sleep, gentle movement, breathing practices, counselling, or support groups can help the nervous system cope better.
Movement
Regular walking, yoga, strength training, or other enjoyable activity can support insulin sensitivity, circulation, mood, and overall health.
The goal is not perfection. It is building a routine that feels steady, nourishing, and realistic.
Reena’s story from Mumbai
Reena, a 28-year-old from Mumbai, had been tracking her cycle carefully. Her follicular study scan showed regular ovulation. Each month, the follicle grew well and ovulation was confirmed.
On paper, that sounded reassuring. Still, pregnancy had not happened yet.
Reena felt confused. If she was ovulating, what else could be missing?
Her doctor explained that ovulation was a good sign, but conception also depends on sperm health, egg quality, tube function, hormone balance, the uterine lining, timing, and embryo development. That conversation helped Reena feel less stuck.
She decided to support her fertility journey with a personalised fertility diet and coaching program. The goal was not to chase quick fixes. It was to understand her body better and make informed nutrition and lifestyle choices.
Through coaching, Reena looked at her usual meals, work schedule, sleep, stress, cravings, and energy levels. Her plan was adjusted to fit her Mumbai routine, including home food, eating out, family meals, and busy weekdays.
She focused on:
Eating protein more consistently
Reducing long gaps between meals
Choosing balanced snacks instead of sugary tea-time options
Improving hydration
Supporting vitamin and mineral intake
Adding gentle movement
Managing stress around cycle tracking
Reena did not receive any promise that a diet plan would guarantee pregnancy. What she gained was clarity, structure, and a calmer way to support her reproductive health while continuing medical guidance.
For many women trying to conceive, that kind of support matters. It helps them move from fear and confusion to informed action.
A reassuring way to look at fertility care
If ovulation is regular but pregnancy has not happened, it does not mean something is “wrong” with you. It means the next step is to look deeper and wider.
Fertility is often a combination of many small factors. Some are medical. Some are related to timing. Some may involve sperm, egg, embryo, hormones, metabolism, or the uterine environment.
IVF can help doctors understand parts of this process more clearly, especially fertilisation and embryo development. Nutrition and lifestyle support can work alongside medical care by supporting the body’s overall reproductive health.
Both matter.
Explore personalised support with BABY DUST
If you are trying to conceive and want guidance that goes beyond generic food lists, the BABY DUST program offers personalised fertility diet and coaching support.
The program has supported many women on their journey to motherhood by helping them make informed choices around nutrition, lifestyle, and metabolic health. It does not promise guaranteed results, but it can offer structure, clarity, and compassionate support during a deeply personal phase.
Fertility can feel overwhelming, but you do not have to navigate every choice alone. A personalised plan can help you understand your body better and take the next step with more confidence.
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