Pregnancy week by week / Week 12
12 weeks pregnant
That’s 3 months — the first trimester, with 28 weeks to go.
Baby size at 12 weeks
Your baby is about 5.4 cm (2.1 in) long and weighs about 14 g — roughly the size of a lime.
What’s happening at 12 weeks
The end of the first trimester is near. Reflexes are developing and the baby can open and close its fingers. Nausea often starts to ease.
Common symptoms at 12 weeks pregnant
- •Nausea easing
- •More energy
- •Dizziness
- •Increased discharge
- •Bump starting to show
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 12 weeks pregnant today, your due date is around Tuesday, December 29, 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 12 weeks pregnant?
12 weeks pregnant is about 3 months, in the first trimester.
How big is the baby at 12 weeks?
At 12 weeks the baby is about 5.4 cm (2.1 in) long and weighs about 14 g — roughly the size of a lime.
What are the symptoms at 12 weeks pregnant?
Common symptoms around 12 weeks include nausea easing, more energy, dizziness, increased discharge. Symptoms vary a lot from person to person — contact your provider if anything worries you.
When is my due date if I am 12 weeks pregnant?
If you are exactly 12 weeks pregnant today, your estimated due date is around Tuesday, December 29, 2026 — 28 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.