Pregnancy in India is usually tracked in months by family and friends — "teesra mahina," "saatvaan mahina" — but your doctor tracks it in weeks, and for good reason. Weeks are far more precise than months, which is why every scan report, due date calculation, and medical decision in your antenatal file is written in weeks and days, not months.
This guide walks through all 40 weeks of pregnancy, grouped by trimester, so you always know roughly what stage your baby's development is at, what changes to expect in your own body, and which checkups are coming up next.
How Pregnancy Weeks Are Counted
Pregnancy is dated from the first day of your last menstrual period (LMP), not from the day you actually conceived. This can feel confusing at first — it means you are already considered "2 weeks pregnant" before conception has even happened. A full-term pregnancy is calculated as 40 weeks from LMP, which works out to roughly 38 weeks from the actual date of conception.
Your doctor's dating ultrasound, usually done between weeks 6 and 9, gives the most accurate estimate of your due date — often more accurate than counting from your last period, especially if your cycles are irregular. Once your doctor confirms a due date at this scan, that date is generally used for the rest of your pregnancy, even if it shifts slightly from your original LMP calculation.
First Trimester: Weeks 1–12
The first trimester is when the most critical development happens, even though very little is visible from the outside. By week 12, every major organ system already exists in basic form.
Ovulation and conception occur around week 2. The fertilised egg implants in the uterine wall by around week 4, roughly when your period would have been due. Most women do not yet know they are pregnant, though a sensitive home urine test can detect the pregnancy hormone (hCG) from around this point.
The neural tube, which becomes the brain and spinal cord, closes by around week 6. The heart starts beating and is often visible on an early ultrasound by week 6–7. This is also when nausea (matli), fatigue, and breast tenderness typically begin and often peak. Your baby is roughly the size of a raspberry by week 8.
Fingers and toes separate, facial features become distinct, and the baby — now officially called a foetus rather than an embryo — starts making small movements you cannot yet feel. By week 12, the baby is roughly the size of a lime, and for many women, nausea starts to ease toward the end of this window.
For a detailed breakdown of symptoms, essential tests, and diet in this period, read our full first trimester pregnancy guide.
Second Trimester: Weeks 13–27
Many women describe the second trimester as the most comfortable — morning sickness usually fades, energy returns, and the bump becomes visibly noticeable. This is also when you will likely feel your baby move for the first time.
The placenta is now fully formed and taking over hormone production from the ovaries, which is a major reason nausea eases around this point. Your baby's sex may become identifiable on ultrasound. Some women start to feel very faint, early flutters late in this window, especially in a second or later pregnancy.
This is when most first-time mothers feel quickening — the first clear baby movements, often described as bubbles or flutters. The 20-week anomaly scan (also called the TIFFA or Level 2 scan) is done in this window and checks the baby's organs, growth, and structural development in detail. Read our full guide on the 20-week anomaly scan to know what to expect.
The baby's movements become stronger and more frequent, and you may start tracking kick counts by the end of this period. Your doctor will screen for gestational diabetes with a glucose tolerance test around week 24–28. By week 27, the baby's eyes can open and close, and hearing is developed enough to respond to loud sounds.
Are you an OB-GYN? Help your patients stay on track with week-by-week milestones, checkup reminders, and symptom logging between visits — fewer anxious calls, better-prepared appointments.
Join aayi free as a doctor →Third Trimester: Weeks 28–40
The final stretch is when your baby gains most of their birth weight and your own checkups become more frequent. It is also when fatigue, back pain, and swelling tend to return as your body prepares for labour.
This is roughly "the seventh month" that families often ask about. Your baby can now open their eyes fully, and rapid brain development is underway. Checkups usually move to every two weeks from this point. Daily fetal kick counts become an important way to monitor your baby's wellbeing — see our guide to kick counts at home.
Your baby is rapidly gaining weight and fat, which helps with temperature regulation after birth. Most babies settle into a head-down position by week 36. Checkups usually move to weekly from around week 36. This is also the time to finalise your hospital bag and birth plan.
Weeks 37–38 are called "early term," and 39 weeks 0 days to 40 weeks 6 days is considered "full term" — the ideal window for delivery when everything is going normally. Your baby's lungs mature significantly during this period. Watch for early signs of labour: regular contractions, your water breaking, or a bloody "show." If you cross your due date, your doctor will discuss monitoring and, if needed, induction, usually by 41 weeks.
Antenatal Checkup Schedule: What Happens When
The Government of India and WHO recommend a minimum of 4 antenatal visits for a low-risk pregnancy, but in practice, most OB-GYNs in India schedule checkups more frequently.
| Weeks | Typical Frequency | What's Usually Checked |
|---|---|---|
| 6–12 | Once, at booking | Dating scan, blood group, haemoglobin, thyroid, infection screening, folic acid started |
| 13–28 | Every 4 weeks | Weight, blood pressure, urine test, foetal heartbeat, NT scan, anomaly scan, glucose tolerance test |
| 28–36 | Every 2 weeks | Growth scans, blood pressure, foetal movement, position check, iron and calcium levels |
| 36–40+ | Weekly | Cervix check, position, weight gain, blood pressure, signs of labour readiness |
For a deeper look at exactly what happens at each visit, read our full antenatal checkup schedule guide.
Warning Signs by Trimester
- Heavy vaginal bleeding, especially with clots or cramping
- Severe, persistent, or one-sided abdominal pain
- Fever above 38°C (100.4°F)
- Sudden, severe headache with vision changes or swelling of the face and hands (possible preeclampsia)
- A noticeable reduction in your baby's movements after week 24
- Your water breaking or regular painful contractions before 37 weeks
- Severe dizziness, fainting, or difficulty breathing
Some mild, period-like cramping as the uterus stretches, especially in the second trimester, is usually normal. Sharp, severe, or one-sided pain is not — when in doubt, call your doctor rather than waiting to see if it passes.
Final Words from Dr. Sai Sudha
Every pregnancy has its own rhythm, and the timelines above are guides, not guarantees — your baby may hit a milestone a week earlier or later than what is typical, and that is usually completely normal. What matters most is attending your scheduled checkups, even the ones that feel routine, because that is when small issues are caught early, before they become bigger ones.
Keep a simple record of your weeks, your symptoms, and your questions as you go — it makes every appointment more useful. And for the moments between visits, when a question comes up at an odd hour, the Aayi Companion app is built to give you reliable, doctor-reviewed guidance whenever you need it.
Frequently Asked Questions
Pregnancy weeks are counted from the first day of your last menstrual period (LMP), not from the date of conception. This means you are already considered about 2 weeks pregnant when conception actually happens, and a full-term pregnancy is 40 weeks from LMP, roughly 38 weeks from actual conception.
Seven months of pregnancy roughly corresponds to weeks 28 to 31, the start of the third trimester. Because months are not a precise medical unit (a pregnancy month is often counted as 4 weeks, not a calendar month), doctors in India track progress in weeks, not months, for accuracy.
Most first-time mothers feel the first flutters, called quickening, between weeks 18 and 22. Mothers who have been pregnant before often feel it earlier, sometimes from week 16, because they recognise the sensation. If you have not felt any movement by week 24, tell your doctor.
The Government of India and WHO recommend a minimum of 4 antenatal visits for a low-risk pregnancy, but most OB-GYNs in India schedule monthly visits until week 28, fortnightly visits from week 28 to 36, and weekly visits from week 36 until delivery — roughly 10 to 14 visits in total.
A baby is considered full term between 39 weeks 0 days and 40 weeks 6 days. Weeks 37 and 38 are called early term, and weeks 41 onward are called late term or post-term. Most Indian hospitals will discuss induction if you cross 40-41 weeks without going into labour naturally.
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