12 Weeks Pregnant: Baby the Size of a Lime

Week 12 is a milestone for many people: the dating scan, often the end of the worst sickness, and the uterus rising up out of the pelvis.

Your baby this week

Reflexes: Your baby can curl their fingers, open their mouth and kick, though you can't feel it yet.
Kidneys: They're making urine, which becomes part of the fluid around your baby.
Proportions: The body is starting to catch up with the head.

More energy for some, as the first trimester ends.
Less need to pee as your uterus rises out of the pelvis, for a while.
Dizziness if you stand up fast. Get up slowly and keep drinking water.
A small bump beginning to show, especially if this isn't your first pregnancy.

You have bleeding, or cramping pain low in your belly
You have sharp pain on one side, pain in the tip of your shoulder, or you feel faint
You're being sick so often you can't keep fluids down
You have a fever, or it burns or stings when you pee

If the pain is severe or you feel faint, call emergency services.

Weeks 10–14

Your dating scan, if it hasn't happened yet.

Week 16

Your next checkup is often around here. What happens at each visit.

Add your own, then bring the list with you.

If you saw the scan together, ask for a copy of the picture. It can be a lovely thing to keep.

Enter your due date once and NUGA knows you're at week 12. The day before each appointment, it gathers what you've noted and the questions to bring.

This page draws on public guidance from:

General information, not medical advice. Every pregnancy is different, and your midwife or doctor knows yours. Last updated October 2026.