Hi,
As you told me your history about sex with your husband and about your periods, it is very difficult that you got pregnant because the maximum life of a sperm inside the female genitalia is maximum of 7 days which happen during ovulation time. Although the time when you had sex was in an unsafe time (the time you could have got pregnant) and you already had your period after that twice, it is extremely rare that you might have been pregnant.
But still just to confirm that you don't have ...
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