Is their a chance or?

So I had sex but he pulled on Nov 1, but we did it two in the morning. I am on birth control I take it everyday but sometimes I am a hour late or maybe two but I take the combo pill I’m suppose to start my period today I been cramping all day yesterday... how long does sperm stay in you?I’m on placebo pills right now. I have 23 days when I start I period when I’m done w/ my period is their a good chance I might be pregnant or when is my ovulation window. I always have scares an me an my boyfriend never have sex w/ out a condom just that one night.