Family planning Melbourne

Calculating a due date

What is the most accurate way to calculate the due date?

Determining the date of birth of your unborn baby is one of the first things parents want to know as soon as the pregnancy test returns a positive result. While most mothers start to experience symptoms such as missed periods, changes in their breasts, fatigue and morning illness. Even after these pregnancy symptoms, one may wonder ‘Am I Pregnant?’ or search for the answer to ‘what are the early signs of pregnancy?

There are several ways to determine the expected date of birth for your baby.


Most pregnancies last about 40 weeks, so the best way to estimate the due date is usually to count 40 or 280 days from the first day of the last menstrual period (LMP). Another option is to subtract 3 months from the first day of the last period and add 7 days.

2. Using an online due date calculator.


3. Getting booked in to see Dr Caroline.

The doctor can perform a fetal growth scan via Ultrasound machine or order a blood test depending on gestational age which can detect the presence of a substance called human chorionic gonadotropin (hCG)


Leave a Reply