if aug 11th you were 7 weeks and 1 day... that would make your date of conception july 6th.
you subtract the 7 weeks and 1 day... and then add 2 weeks (thats how i came up with july 6th). the first 2 weeks of 'pregnancy', you arent really pregnant. those are the 2 weeks between the first day of your last period and the day of conception.
if you have any more questions, you can send me a message or reply on here and ill try to help you out =)
