Are due dates calculated based on last menstrual period?

My last period started on march 7. My cycle is anywhere form 49-70 days. I conceived on April 17 18 or 19. When will my due date be??|||Your due date will be calculated by an ultrasound.|||definitely go by your conception date, it will be much more accurate. Also, at your first u/s scan they will measure and date you that way. That should be pretty accurate and on point with your conception date.|||Doctors will add 10 months to the date of the first day of your last period and then subtract a week to give you an estimated due date. So yours would be around....Dec, 31. There is also a site called babycenter.com that has a calender and you can figure out your estimated due date there as well.|||when ur OB will take a ultrasound she or he could give u a close due date in this case.|||Based on your LMP your due date is approx. 12/12/2008 based on a 28 day cycle.





http://www.askdramy.com/pcalctry.html|||My periods are irregular so my doctor did an ultrasound. I was only six weeks pregnant instead of eight weeks. I would go by your last period until the doctor does an ultrasound to measure the baby.|||yes they go by an estimate on your missed period and then they do an ultrasound to confirm it .. and get an exact time..and ur due date should be around january 17th 2009.. a few days before or after.. Just count 40 weeks from ur conception date :) Congrats girl and hope all goes well :)|||Around January 8th from the days you give for conception. This is 38 weeks from conception because with a normal 28 day cycle it would be 40 weeks from you last period, and conception is 2 weeks after that. But definitely check it out with your doctor, once they do the ultrasound they'll be able to date you much better! Good luck!|||Yes. Your due date is 40 weeks from the first day of your LMP.