 [ Symptoms ] i need help knowing when i conceived  i am 37 weeks pregnant and i had an ultrasound on november 19th 2015 which said i was 5 weeks 5 days my due date is july 16th   can anybody tell me when i would have conceived thank you [ Disease ] hi if like my wife you keep a little book noting down when you your periods start then you need to look about 6 to 7 weeks before that november date because your pregnancy goes from that date so it would have been 14 days after that date give or take a day your ovulation day is day 14 after the first day your period started so you must have had unprotected sex 3 to 7 days before that date and that is the only real way you can work it out ok hope this helps you good luck