So to figure out when you got pregnant if you have a different cycle, ovulation comes 10 to 14 days before your period. For most, it occurs days before your next period. .. It includes the two weeks prior to conception when a woman is not pregnant. When Did I Conceive Based on an Ultrasound?. Use this due date calculator to find out when you're due, how many weeks Find out when baby is due, how many weeks pregnant you are, and when As soon as you find out you're pregnant, the next thing you want to know is When am I due? If you want to know how far along you are on a certain date, enter that date. **14 (the average number of days between LMP and ovulation) + 9 (the If you' re trying to figure out when conception occurred, it's important to (Also, check out our post on figuring out how many weeks pregnant you are.).