How do I calculate my pregnancy due date?

Enter the first day of your last menstrual period (LMP) into the calculator. Your due date is approximately 40 weeks (280 days) from that date. The calculator also shows your current week of pregnancy and trimester automatically.

When is the best time for a 3D or 4D baby ultrasound?

The ideal window for clear 3D and 4D baby ultrasound imaging is 26 to 32 weeks pregnant. At this stage, baby has developed soft rounded facial features but still has enough amniotic fluid and space to move. Book at PeekABaby Toronto — call (437) 607-7117.

What is the difference between my due date and my ultrasound date?

Your LMP-based due date is an estimate. An early ultrasound between 8 and 14 weeks gives a more accurate due date based on baby's measured size. PeekABaby offers early pregnancy dating scans from 8 weeks at our Scarborough studio.

How many weeks is a full-term pregnancy?

A full-term pregnancy is typically 40 weeks (280 days) from the first day of your last menstrual period. Babies born between 39 and 40 weeks are considered full term. The first trimester is weeks 1-12, second trimester weeks 13-26, and third trimester weeks 27-40.

Free Pregnancy Calculators

When will your little one arrive?

Name: PeekABaby Ultrasound Studio
Address: 2855 Markham Road, Toronto, ON, M1X 0C3, CA
Telephone: (437) 607-7117
Price range: $

Five free tools in one place — estimate your due date, track your pregnancy week, plan around ovulation and your period, and check healthy weight gain. Plus the ideal window for a 2D, 3D or 4D ultrasound.

Why timing matters

The right scan at the right week

Knowing how far along you are makes choosing your PeekABaby session simple. Each stage of pregnancy offers something different to see.

8-14 weeks — confirm the heartbeat and get early reassurance with a Heartbeat or Early Pregnancy scan.
15-22 weeks — the ideal window to discover your baby's gender.
26-32 weeks — the golden window for crisp 2D, 3D and 4D facial imaging.
33+ weeks — still possible for 4D, though booking early is best as space gets cosy.

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Understanding your trimesters

A gentle overview of the journey

First trimester

Weeks 1–13. Your baby's major organs and that remarkable heartbeat take shape. A wonderful time for early reassurance.

Second trimester

Weeks 14–27. Movements become noticeable and gender can be seen — often the most comfortable stretch of pregnancy.

Third trimester

Weeks 28–40. Baby fills out with soft, rounded features — the perfect time for stunning 3D and 4D portraits.

When will your little one arrive?

Calculate your dates

Your pregnancy at a glance

Pregnancy weight gain

Your healthy weight gain

Find your due date

Your due date & milestones

Ovulation calculator

Your fertile window

Period calculator

Your next periods

The right scan at the right week

A gentle overview of the journey

First trimester

Second trimester

Third trimester

Found your perfect scan window?