Okay so im trying to figure out my conception date okay i went to the docs on sept 7 th and i was told by vaginal ultrasound that i was eight weeks pregnant... I had spotting on july 14th that i thought was a regular period but i know it wasnt i bled for three days spotting only... Me and bf had sex on the 4th 11th 12th 18th and 19th the fourth was pull out nothing got in me the rest werent so with that ultrasound date does it mean we conceived on the 13th??? And it inplanted a day later?? I also got another ultrasound at 12 weeks that gave a date of july 16 th which is only two days diff so when did i conceive???