5 weeks pregnant is how many months?
At 5 weeks you are in the 2nd month of pregnancy, within the first trimester. The conversion uses the real average of 4.345 weeks per month, which is why "4 weeks = 1 month" only works as a rough guide early on.
Your baby at 5 weeks
The neural tube — the start of the brain and spinal cord — begins to form. Around now, the size is comparable to a sesame seed.
Table: weeks to months (around week 5)
| Weeks | Month | Trimester |
|---|---|---|
| 4 weeks | 1st month | 1st trimester |
| 5 weeks ← | 2nd month | 1st trimester |
| 6 weeks | 2nd month | 1st trimester |
| 7 weeks | 2nd month | 1st trimester |
| 8 weeks | 2nd month | 1st trimester |
Frequently asked questions
How is the conversion done?
A month averages 30.44 days = 4.345 weeks. We divide 5 weeks by 4.345 and add 1 for the current month: that gives the 2nd month.
How many weeks am I? I’m not sure how to work it out
Use our due date calculator: enter the first day of your last period to see your weeks, trimester and estimated due date — all worked out on your device.
References
- ACOG – How your fetus grows during pregnancy
- NHS – You and your baby at [X] weeks pregnant
- Office on Women’s Health (US) – Stages of pregnancy
This page will be reviewed by a named OB-GYN before launch. Educational content — not medical advice.
Medical disclaimer: This tool and content are for educational purposes only and are not a substitute for professional medical advice. If something feels wrong, see a doctor.