If due date was sept 25 when did you conceive?

To calculate the approximate date of conception, you can work backward from your due date. Generally, pregnancy lasts around 40 weeks (or 280 days) from the first day of your last menstrual period (LMP) to the expected delivery date.

Here's how you can estimate the date of conception:

1. Subtract 280 days from your due date (September 25):

September 25 - 280 days = February 6

This gives you an estimated conception date of February 6.

2. Confirm with an ultrasound:

It's worth noting that the estimated date of conception might vary slightly. Your healthcare provider can confirm the exact date through an ultrasound, which can provide precise measurements of fetal development and help determine the actual gestational age.