Putting in another group

Its been a heck of a while since ive

been on this app. Now i need advice

and help. Sept 17th my bf and i had

sex. It was also like day 3 of my period

and my periods are super irregular to

begin with. But never short. My period

is done now. We had sex 2 times this

weekend. The 16th and the 17th. I think

the sex "cleaned" me out but whats

nerve racking to me right now... he

finished in me on the 17th. If my period

is over with earlier then its normal 7

days, should i be worried at all with him

finishing in me? Should i play it safe

and get a plan b? Im at a loss and i cant

talk to my mother about it. We are both

25 and should know better but we were

in it too good and i was dumb and told

him to. Advice please