when did i conceve based on due date
This estimate is based on the last menstrual period and the estimated date of conception. Your pregnancy due date calculator works by adding 40 weeks (280 days) to the approximate first day of your last menstrual period or 266 days to the day of ovulation.Try our Reverse Due Date Calculator to find out when you became pregnant.our pregnancy due date calculator works by adding 40 weeks (280 days) to the approximate first day of your last menstrual period or 266 days to the day of ovulation.