Could I be pregnant even if I got my period on time?!?

Mayra

Hey ya’ll!! I had sex on NYE (dec 31st) and my next period was scheduled to come Jan 8th ish. Well on the Jan 7th I got my period as usual. So I thought everything was cool. Come to find out the guy I had sex with told me he CAME INSIDE of me on NYE. So now I’m just being paranoid thinking there’s a possibility that I could..... should I worry Or should I wait until my February period shows up to know for sure if I’m pregnant?