I Started My Period The 20th Of April And My

I started my period the 20th of April and my boyfriend and I had sex the 22nd and the condon slipped off and he ejaculated in me. I have been done with my period since Sunday the 24th. Last night I went pee and when I wiped there was light pink in the toilet paper and it went into today but now is pretty much gone. Is it possible I could be pregnant? What are the possibilities of that if I was on my period ?