sorry above should read
"...also would NOT cause..." sorry : D
It also would cause period like bleeding for 2 days. Spotting 7-10 days after sex is more likely to be implantation bleeding.
Implantation bleeding doesn't occur after that short of time, IF it even happens.
It could have been implantation bleeding, she said her period is usually 7-8 days
No, if you had a period after the intercourse you cannot be pregnant.
Ofcourse, there is a chance that You could pregnant however it is still early and would be impossible to find out this soon.
It is possible You had some mild bleeding a few days later because of the sex however only time will tell
Far too early to tell. You need to wait two weeks from the last time you had sex and take a pregnancy test with first morning urine.