🤰 12 Weeks Pregnant

You are in week 12 of your pregnancy — the first trimester, month 3. Your baby is about the size of a lime. Reflexes begin: the baby can curl its toes and make sucking movements.

By the Power Calculators team Updated 5 Nov 2026

Baby is the size ofa lime

TrimesterFirst

MonthMonth 3

Weeks to due date28

Your baby at 12 weeks

Reflexes begin: the baby can curl its toes and make sucking movements.
The intestines move from the umbilical cord into the abdomen.

Average length	5.4 cm (2.1 in), crown to rump
Average weight	14 g (0.5 oz)
Size comparison	A lime
Days completed	84 of 280 (30%)

Your body at 12 weeks

The womb rises above the pubic bone, so a doctor can feel it.
Risk of miscarriage falls considerably after this week.

To do this week

Many parents share their news after the 12-week scan.

When to call your doctor

Vaginal bleeding or fluid leaking
Severe tummy pain or cramping
Fever over 38 °C
Severe headache, blurred vision or sudden swelling of face or hands
Vomiting so much you cannot keep fluids down

Pregnancy Due Date Calculator

Find your estimated due date, conception date and how far along you are, from the first day of your last period.

Pregnancy Week Calculator

Find exactly how many weeks and days pregnant you are today, your trimester and your due date.

When to Take a Pregnancy Test Calculator

Find the earliest day to take a pregnancy test and the most accurate day, from your last period and cycle length, with implantation dates and test accuracy by day.

Frequently asked questions

How many months is 12 weeks pregnant?

12 weeks is in month 3 of pregnancy as months are usually counted (about 2.8 calendar months since your last period), in the first trimester.

How big is the baby at 12 weeks?

About the size of a lime: around 5.4 cm long and 14 g (0.5 oz).

What should I do at 12 weeks pregnant?

Many parents share their news after the 12-week scan.