5 Weeks Pregnant
Summary
Size
sesame seed
Length
0.3 cm
Weight
0.5 g
Until due date
35 weeks
5 / 40 week
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What's Happening With Your Baby
The neural tube — the foundation of the brain and spinal cord — is closing. The first structure of the heart is forming and begins to beat towards the end of this week. The umbilical cord and placenta are being built to carry nutrients to the baby.
What's Changing For You
Symptoms start to become noticeable this week: breast tenderness and fullness, deep fatigue, frequent urination and a sharper sense of smell. Mood swings are hormonal and entirely normal.
To Do This Week
Call your doctor to book your first prenatal appointment.
Tell your doctor about every medication you take; some need to be changed in pregnancy.
Don't fight the fatigue — short daytime naps are a legitimate need in this period.
Frequently Asked Questions
How many months is 5 weeks pregnant?
Week 5 of pregnancy falls in month 2 and in the first trimester. Pregnancy months don't run in neat four-week blocks, so the week-to-month conversion rarely lands on a whole number — which is why pregnancy is tracked in weeks.
How big is the baby at 5 weeks?
At 5 weeks your baby is roughly the size of a sesame seed: around 0.3 cm long and 0.5 grams. These are averages; clear variation between babies is normal, and what matters is the growth curve your doctor is tracking.
How long is left at 5 weeks pregnant?
Assuming a 40-week pregnancy, you have around 35 weeks left at week 5. Most births happen between weeks 37 and 42, so a due date is a range rather than a fixed day.
What should I watch out for at 5 weeks?
Call your doctor to book your first prenatal appointment. Tell your doctor about every medication you take; some need to be changed in pregnancy. Don't fight the fatigue — short daytime naps are a legitimate need in this period.
Track your pregnancy week by week
Baby Wallie brings your baby's weekly development, your health logs and AI-powered nutrition, sleep and breathing programs into one app. Free for 7 days.
Related Guides
When To Seek Care Immediately
Whatever week you are in, contact your doctor or the nearest health facility without waiting if you have: vaginal bleeding or fluid loss, severe persistent abdominal pain, a severe headache, blurred vision or flashing lights, sudden swelling of the hands or face, a fever above 38 °C, burning on urination with fever, persistent vomiting, fainting, or — after week 28 — a clear reduction in your baby's movements. In these situations reach real medical care rather than an app or a web search.
This content is for informational purposes only and does not replace medical advice. Always consult your doctor or midwife about your own or your baby's health.