If i consive a baby today, when will it be due?

38 weeks from today: Women generally cannot tell that they are conceiving at the moment. However, if you somehow were able to know that you are conceiving today, just count 38 weeks into the future on the calendar. Today is friday, so the friday 38 weeks from now is the estimated due date. Of course, most babies are not born on their estimated due dates, but are often born shortly before or after their due dates.