(This sounds harsh in written format. It's not intended to sound harsh!)
What exactly are you asking? You said you got pregnant in September. Then you therefore got pregnant during one of the times that you had sex in September.
I'm assuming you had a miscarriage in August and found out you were pregnant in September. Either way, it is possible to ovulate a week after a miscarriage, no period needed. I had a miscarriage in 2005, was hemorrhaging badly, therefore had to have a d&c and I ovulated 2 weeks later, before I had a period. I know I ovulated because of the ovulation pain in my ovary. However, it is not safe to become pregnant so quickly after a miscarriage, all the doctors and research say to wait as least one cycle before trying again. Obviously that info doesn't help now but if you had a d&c or passed the sac on August 21 you very well could have gotten pregnant again at the end of August or sometime in September.
Probably round about mid September. If your menstrual cycle is regular at about 28 days, then you probably ovulated about 12th - 15th September. However, it isn't possible to be more precise. In addition, sperm will survive for several days after sex, so they could have been there before you ovulated.
It takes 2-3 week after the date of conceive to tell that your pregnant with the pregnancy test, The date of your last period sometimes can be wrong because some woman get it while pregnant and not knowing they are, whilst others don't get it but are not at all the due date they're given. Your date of conceive is roughly the 31st of August and could be a week before that.
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