General information only — not medical advice. This page provides general, well-established information about pregnancy development and is intended for informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your qualified healthcare provider with any questions about your pregnancy.

4 Weeks Pregnant

Q: What trimester is week 4 of pregnancy?

Week 4 falls in the First Trimester. The first trimester covers weeks 1–13, the second trimester covers weeks 14–27, and the third trimester covers weeks 28 through delivery. This is a general informational guide — consult your healthcare provider for personalized guidance about your pregnancy.

Q: How many weeks are left at 4 weeks pregnant?

At 4 weeks pregnant, there are approximately 36 weeks remaining until the estimated due date (based on a standard 40-week pregnancy). Individual pregnancies vary — due dates are estimates, and normal delivery typically occurs between weeks 37 and 42. Always consult your healthcare provider for information specific to your pregnancy.

First Trimester — ≈36 weeks to go

Week 4 Week 40 (due date)

Week 4 falls in the First Trimester — ≈36 weeks to go. A standard pregnancy is counted as 40 weeks from the last menstrual period. Individual pregnancies vary — due dates are estimates, and normal delivery typically occurs between weeks 37 and 42.

Development at 4 Weeks

Around week 4, implantation is typically completing as the fertilized egg embeds in the uterine lining. The level of hCG (human chorionic gonadotropin) begins to rise, which is what home pregnancy tests detect. This is generally the earliest a positive test result may appear. The embryo at this stage is tiny — roughly the size of a poppy seed.

Size Comparison

Approximate size — week 4

Poppy seed (~2 mm)

Common Experiences at 4 Weeks

Many people do not yet know they are pregnant at week 4, though some may notice breast tenderness or mild fatigue. A missed period is often the first signal. Some people feel very little different at this stage. These early experiences vary widely from person to person.

Experiences vary widely between individuals. If you have concerns about any symptom, contact your healthcare provider.

General Planning Checklist — Week 4

These are general planning suggestions only — not medical instructions. Follow your healthcare provider's specific guidance for your pregnancy.

Schedule your first prenatal appointment if you haven't already, following your provider's recommended timing
Begin taking a prenatal vitamin if your provider recommends it
Note the first day of your last menstrual period to share with your provider
Consider who you would like to include in your support network

Nearby Weeks

5 Weeks Pregnant · 6 Weeks Pregnant

Frequently Asked Questions

What trimester is week 4 of pregnancy?

Week 4 is in the First Trimester — ≈36 weeks to go. The first trimester covers weeks 1–13, the second trimester covers weeks 14–27, and the third trimester covers weeks 28 through delivery. This is general information — your healthcare provider can give you guidance specific to your pregnancy.

How many weeks are left at 4 weeks pregnant?

Based on a standard 40-week pregnancy, week 4 means approximately First Trimester — ≈36 weeks to go with time remaining as noted above. Keep in mind that due dates are estimates — normal delivery typically occurs between weeks 37 and 42. Always follow your healthcare provider's guidance about your specific pregnancy.

Not medical advice. The information on this page is for general informational purposes only. Pregnancy experiences vary significantly between individuals. Nothing on this page should be used as a basis for medical decisions. Always consult a qualified healthcare provider for advice about your specific pregnancy, symptoms, or health concerns. In an emergency, contact emergency services immediately.