Um, you can't conceive the day before you have sex. If you have sex on March 16 you could have gotten pregnant March 16 through March 21. Sperm also only lives up to 5 days in the body and is not certain that it can fertilize for that long, so the most likely days are March 16 to March 19, though it is possible up until March 21.
Ovulation date does not = conception date unless you conceive (fertilize the egg) on the day you ovulate. You can ovulate and then conceive up to a day later. In my case, I ovulated on Dec. 4 and I conceived on Dec. 5.
If I had sex on the 25th 27th an then 31st of december I had a period. In jan between the 1st an the 5th it lasted 3-5 days I think I had a period in feb I'm sure I did between the 1st an 5th my periods are the same every month. I got bk with my ex an had sex with him on the 11th feb till I found out I was preg 4 weeks ago an now I think I'm 9 weeks as I done test anit said 3+ weeks plus on the 9th of feb is it my ex's as I'm really worried please can u help this is my 3rd child I'm sure it is my ex's just need 2 put my mind 2 rest
I didn't have sex with any1 else just those three times in december then with my ex on the 11th feb I new it was his just really playing on my mind as I have never got pregenet so quick before thank you. For your help