Pregnancy is roughly 40 weeks from your last menstrual period, divided into three trimesters. Each brings its own set of changes, milestones, and things to watch for. If this is your first pregnancy, a week-by-week account from the internet can feel overwhelming. This guide keeps it practical, trimester by trimester, so you know what is expected and what deserves a call to your doctor.
First trimester: weeks 1 to 12
The first trimester is when the pregnancy establishes itself. You may not even look pregnant yet, but a great deal is happening.
- Nausea and vomiting (morning sickness) are extremely common and can actually happen at any time of day. Eating small, frequent meals and staying hydrated helps.
- Fatigue is often the most noticeable symptom. Your body is building the placenta, and progesterone levels are rising sharply.
- Breast tenderness and a frequent need to urinate are normal early changes.
- Mild cramping can occur as the uterus starts to grow. However, severe pain or heavy bleeding is not normal and needs immediate medical attention.
- Your first antenatal visit usually happens around 6 to 8 weeks. An ultrasound will confirm the pregnancy location, check for a heartbeat, and date the pregnancy.
- Key early tests include blood group, haemoglobin, thyroid function, blood sugar, hepatitis B, HIV, and a urine test.
Second trimester: weeks 13 to 27
Often called the most comfortable trimester. Nausea usually settles, energy returns, and the baby bump becomes visible.
- You will start feeling the baby move, usually between 18 and 22 weeks for a first pregnancy. These flutters become kicks over the following weeks.
- The anomaly scan (detailed ultrasound) is done around 18 to 20 weeks to check the baby's anatomy and development.
- Your doctor will monitor blood pressure, weight gain, and uterine growth at each visit.
- Some women develop back pain, leg cramps, or heartburn as the uterus grows. These are common nuisances, not usually danger signs.
- Gestational diabetes screening (glucose challenge test) is typically done between 24 and 28 weeks.
- Skin changes such as darkening of the midline of the abdomen and stretch marks may appear.
Third trimester: weeks 28 to 40
The final stretch. The baby is growing rapidly and your body is preparing for delivery.
- Breathlessness, heartburn, and difficulty sleeping become more noticeable as the baby takes up more space.
- Braxton Hicks contractions, irregular tightening of the uterus, are normal. They differ from true labour contractions, which become regular, increasingly strong, and closer together.
- Foetal kick counts become important. Your doctor will guide you on how to monitor them. A noticeable decrease in movement should always be reported.
- Visits become more frequent, often every two weeks after 28 weeks and weekly after 36 weeks.
- Your doctor will discuss your birth plan, signs of labour, and when to go to the hospital.
- Swelling of the feet and ankles is common, but sudden swelling of the face or hands, a severe headache, or visual disturbances can signal pre-eclampsia and need urgent evaluation.
Red flags at any stage
Certain symptoms during pregnancy are always urgent and need immediate medical help.
- Heavy vaginal bleeding.
- Severe abdominal pain.
- Leaking of clear fluid from the vagina (possible ruptured membranes).
- High fever.
- Severe headache with visual changes or swelling (possible pre-eclampsia).
- Sudden significant decrease in baby movements in the third trimester.
If you experience any of these, call your doctor or go to the nearest hospital without delay. In an emergency, call 108.
Pregnancy can bring a lot of emotions, not all of them joyful, and that is completely normal. If anxiety or low mood is becoming persistent, please talk to your doctor about it. You can also reach the free national Tele-MANAS mental health helpline at any time on 14416 (or 1800-891-4416). If you or someone near you is in immediate danger, call 108 or go to the nearest hospital.
A word from our clinic
I am Dr. Samta Singhania, a gynaecologist and obstetrician with 22 years of experience, practising at Prudent International Health Clinic in Viman Nagar, Pune. We provide antenatal care from the first visit through delivery planning, with referral to our accredited partner hospitals when the time comes. All routine consultations, ultrasounds, and blood tests are coordinated from our clinic. We are open all 7 days, 9 AM to 9 PM, with walk-ins welcome. Call or WhatsApp us on +91 70287 22200. For current pricing, call the clinic on +91 70287 22200.
