🤰 13 Weeks Pregnant

You are in week 13 of your pregnancy — the first trimester, month 3. Your baby is about the size of a pea pod. Vocal cords and teeth buds are forming.

By the Power Calculators team Updated 5 Nov 2026

Baby is the size ofa pea pod

TrimesterFirst

MonthMonth 3

Weeks to due date27

Your baby at 13 weeks

Vocal cords and teeth buds are forming.
The placenta now produces most of the pregnancy hormones.

Average length	7.4 cm (2.9 in), crown to rump
Average weight	23 g (0.8 oz)
Size comparison	A pea pod
Days completed	91 of 280 (33%)

Your body at 13 weeks

This is the last week of the first trimester. Energy often returns.

To do this week

Last week for the NT scan (up to 13 weeks 6 days).

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 13 weeks pregnant?

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

How big is the baby at 13 weeks?

About the size of a pea pod: around 7.4 cm long and 23 g (0.8 oz).

What should I do at 13 weeks pregnant?

Last week for the NT scan (up to 13 weeks 6 days).