Pregnancy Chances??

I had sex last back in September. It was unprotected and I’m pretty sure he didn’t fully finish inside me. I took a plan b and had my period a couple days later. I had my period in October too and it was around the right time for it to come. I haven’t had it yet this month and I’m only 2 days past but it’s making my anxiety spike and I’m worried. I’m probably going to get a test later, but I was just wondering how likely it seems??