Week 5: A positive test
You’re 5 weeks pregnant — about 35 weeks to go. Your baby is roughly the size of a sesame seed.
Size of
a sesame seed
Length
0.3 cm
0.1 in · crown to rump
Weight
—
Your baby this week
The neural tube — the foundation of the brain and spinal cord — is forming, and a primitive heart begins to fold and flutter. Major organ systems are being mapped out.
Your body & how you might feel
Pregnancy hormones surge, and early symptoms can arrive fast. This is a great time to book your first prenatal appointment.
Common symptoms at week 5
- Fatigue
- Nausea
- Frequent urination
- Sore breasts
This week’s tip: Call your provider to schedule your first appointment — most are at 8–10 weeks, and booking early secures your spot.
A gentle reminder: This is an estimate, not medical advice. Dates and figures are general guidance — every pregnancy is different. Your healthcare provider’s assessment, especially from an early ultrasound, always takes priority. Always speak with your provider about your pregnancy.
Week 5 FAQs
How big is the baby at 5 weeks?
At 5 weeks pregnant, your baby is roughly the size of a sesame seed, about 0.3 cm (0.1 in) long. These are typical averages — every baby grows at its own pace.
How many months is 5 weeks pregnant?
5 weeks pregnant is about 1 month, in the first trimester, with about 35 weeks to go until your due date.
What are common symptoms at 5 weeks?
Common experiences around week 5 include fatigue, nausea, frequent urination, sore breasts. Symptoms vary widely — contact your provider if anything worries you.