Trimesters of Pregnancy: What to Expect and When to Call a Doctor
A clear guide to the trimesters of pregnancy: what changes, which checks are typical, and which warning signs need a doctor.
The trimesters of pregnancy divide the roughly 40 weeks into three stages, and each stage brings different changes, checks and questions. Knowing what is typical in each one makes it easier to plan appointments and to spot the signs that need a doctor.
This guide walks through all three trimesters of pregnancy in plain language. Timing can vary between doctors, so treat the week ranges as a guide and follow your own doctor's plan.
The Trimesters of Pregnancy at a Glance
The trimesters of pregnancy are the first (about weeks 1 to 12), the second (about weeks 13 to 27) and the third (about weeks 28 to 40). Weeks are counted from the first day of your last period, and each trimester has its own typical symptoms, scans and blood tests.
| Stage | Weeks | Typical focus |
|---|---|---|
| First trimester | About weeks 1 to 12 | Confirming the pregnancy, dating scan, blood group and basic blood tests, early screening |
| Second trimester | About weeks 13 to 27 | Detailed anatomy scan, blood sugar screening, blood count review |
| Third trimester | About weeks 28 to 40 | More frequent visits, growth and blood pressure checks, birth planning |
First Trimester: Weeks 1 to 12
The first stage of the trimesters of pregnancy is when the body adjusts to rapid hormone changes. Many women feel very tired and notice nausea, breast tenderness or needing to pass urine more often. Some feel little at all, and that is also normal.
Whichever of the trimesters of pregnancy you are in, ask your doctor about folic acid and about any medicines or supplements you take, since some are not recommended in pregnancy.
Need pregnancy blood tests at home?
WhatsApp DrPlus to arrange sample collection in Dubai.
Second Trimester: Weeks 13 to 27
Many women feel better in this part of the trimesters of pregnancy. Nausea often eases, energy improves, and the bump starts to show. Most people begin to feel the baby move somewhere in this stage.
Anatomy scan
A detailed ultrasound, usually around weeks 18 to 22, checks the baby's growth and development.
Blood sugar screening
Screening for gestational diabetes is commonly done at around weeks 24 to 28.
Blood count review
Your doctor may repeat a blood count to check for anaemia, which is common in pregnancy.
Feeling movement
Tell your doctor if you are unsure about movements or notice a change once they are established.
Third Trimester: Weeks 28 to 40
The last stage of the trimesters of pregnancy is about monitoring and preparing. Visits become more frequent, and your doctor pays close attention to blood pressure, the baby's growth and position, and your overall wellbeing.
Swelling, backache, heartburn and poor sleep are common now. They are usually harmless, but sudden or severe changes should always be checked.
Habits That Help in Every Trimester
This guide is general information and does not replace antenatal care. Scan dates, test timing and advice differ between women, so always follow your own doctor's plan.
Warning Signs in Any Trimester
- Heavy vaginal bleeding, or bleeding with pain
- Severe or one-sided abdominal pain, especially early in pregnancy
- Fluid leaking from the vagina, or regular contractions before 37 weeks
- Severe headache, vision changes or sudden swelling of the face and hands
- Reduced or absent baby movements
- Vomiting so severe you cannot keep fluids down, or a high fever
Pregnancy Support in Dubai
DrPlus can help with the practical parts of antenatal care at home. You can start with a pregnancy test at home in Dubai, arrange routine pregnancy bloods through blood test at home in Dubai, and ask about NIPT prenatal screening at home.
For a non-urgent concern between appointments, a doctor on call in Dubai can visit you at home. Message the team on WhatsApp and they will confirm the details.
Pregnancy Tests and Doctor Visits at Home
DHA-licensed team. Home sample collection across Dubai.