If we need to calculate manually, i think our maths have to be very good.
So, go for the easy way, there is already many website and apps built to count for you.
But you need to remember your Last Period in order to calculate your Due Date.

If you cannot remember your last period, there is still way to know. You have to visit gynaecologist to scan your baby size to determine your due date.

Enter your last period or date of conceived to the website below, voila... You get your Due date.

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