like wth?

okay so on tuesday me and my boyfriend were having sex, and i started bleeding and i thought my period started because im suppose to have my period already but when i got home and everything there was no bleeding or anything at all. so im so confused on why i bled only at that time? and btw the sex was only like 5 minutes then i started bleeding. 
any girls know what this couldve been. 
* ( had sex last month 3 times he cummed in me 7 times, but had my period ) 

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