Am I pregnant ?

Me and my boyfriend had sex this Monday the 20th of November. We used protection, but at first he said he wasn’t sure the condom fit him correctly. He somehow managed to put it on anyways and after that he told me he came inside of me. I’m not really on top of my cycle I don’t really know my cycle days or nothing I think I’m irregular, but I’m usually late by a week most times nothing longer than that. I was wondering if it’s possible I might get pregnant I only remember that my last period was around Oct 29th -Nov 3rd.