I am 5 weeks and 3 days, when did i conceive? i think my period was on the 28 or 29 of june. i had sex on the 3rd of july and on the 15th of july.

3 weeks 3 days ago: The estimated conception date is officially set at "2 weeks gestation" which is "2 weeks pregnant," which is 3 weeks 3 days ago in this case. Actual conception date (sperm meets egg) is never known in a natural pregnancy, but happens at some moment from approximately 0 to 5 days after sex. In real life, it almost never matters exactly when conception happens.