Quit birth control, could I get pregnant?

Hello! I stopped taking my birth control with a couple active pills left on Dec 18th. I had unprotected sex on Dec 19th and the 20th. Both times my husband finished inside of me. I had some spotting which I assume is my withdraw bleed Dec 21st-24th. I also had unprotected sex on Dec 23rd, but he didn’t finish inside of me. And on the 24th, when he did finish inside of me. My period is due in 12 days, although I’m not sure how accurate that is considering I just quit taking combination birth control pills.

I’m wondering if anyone has had a similar experience and ended up pregnant. Has anyone gotten pregnant this soon after stopping birth control and what are my chances?