If your cycles are generally 28 days, and if you had sex on the 8th, then your estimated date of conception would be July 22, 2007.
The egg lives for about 1 day while sperm can live for about 3 to 5 days. Conception is most likely to occur when intercourse occurs in the 4 to 5 days before ovulation or on the day of ovulation.
So to answer your question, yes there is a chance you could be pregnant.
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17+ years, Healthcare Expert