Sex with an x

Soooo yeah I got really drunk Friday night and ended up having sex with my x (major mistake, I know) I am on birth control and I'm on my period when it happened. I'm quitting the pill because I won't be having sex for a while so today is gonna be the first day I haven't taken the pill in a year. When we had sex Friday he pulled out and came in my ass and I think I was on day 3 of my period taking the sugar pills. Do you think I will be protected for that time even though I'm quitting the pill tonight ? He said no cum got in me I just wanted to see if I should continue taking bc to make sure I'm okay