Dating your pregnancy
Knowing this can help you to be prepared for labour and birth, and to have everything ready for your new baby. Your first pregnancy scan will probably happen when you're between 10 weeks and 14 weeks pregnant.
It's known as the dating scan, and is used to give you a more accurate due date, based on the size and development of your baby.
This will give you an estimated date of conception, which will usually be about two weeks after the first day of your LMP.
So you will be two weeks further along in your pregnancy if it's calculated according to your LMP rather than your estimated date of conception.
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The person performing the scan (sonographer) will measure your baby from his head to his bottom.
Have you tried adding, subtracting, multiplying, and counting on your fingers?
Find out when your baby is due with our handy pregnancy calculator.
Our calculator uses this information to give you an estimated due date.
Unfortunately, no one can say for sure exactly when your baby will arrive.