Pregnancy week by week / Week 13
13 weeks pregnant
That’s 3 months — the first trimester, with 27 weeks to go.
Baby size at 13 weeks
Your baby is about 7.4 cm (2.9 in) long and weighs about 23 g — roughly the size of a lemon.
What’s happening at 13 weeks
The final week of the first trimester. Tiny fingerprints have formed and vocal cords are developing. Energy levels often start to return.
Common symptoms at 13 weeks pregnant
- •Energy returning
- •Increased libido
- •Occasional headaches
- •Visible bump
- •Less frequent urination
Every pregnancy is different — you may have all, some or none of these. Contact your doctor or midwife about anything that concerns you.
Count down to your due date
If you’re 13 weeks pregnant today, your due date is around Tuesday, December 22, 2026. Adjust the date below and create a free countdown to share.
First day of your last menstrual period (how doctors date a pregnancy)
⚕️ This is an estimate based on Naegele’s rule (40 weeks from your last period). Only about 1 in 20 babies arrive on the exact due date. Always confirm with your doctor or midwife.
FAQ
How many months is 13 weeks pregnant?
13 weeks pregnant is about 3 months, in the first trimester.
How big is the baby at 13 weeks?
At 13 weeks the baby is about 7.4 cm (2.9 in) long and weighs about 23 g — roughly the size of a lemon.
What are the symptoms at 13 weeks pregnant?
Common symptoms around 13 weeks include energy returning, increased libido, occasional headaches, visible bump. Symptoms vary a lot from person to person — contact your provider if anything worries you.
When is my due date if I am 13 weeks pregnant?
If you are exactly 13 weeks pregnant today, your estimated due date is around Tuesday, December 22, 2026 — 27 weeks from now. Use the calculator below with your real last-period date for a personalised estimate.
See every stage on the pregnancy week-by-week guide or open the full due date calculator.