PLAN B aftermath? (HELP)

Okay so I took plan b for one mishap that me & my SO had. & I know those mess up ur cycle. So I ended up getting my period 2 weeks early. And it lasted 3 days and was very very light! I usually last (5 days & it’s heavy). And I been feeling so nauseas. To the point If ride in the back seat of a car too long I’ll feel the need to throw up. Also I should add me & my SO don’t use any form of birth control just the pull out method. And we did have sex before and after I took plan b. How likely is it that I could even possibly be pregnant. I feel dumb asking this but the nausea is what’s throwing me off.

Ps: I was ovulating around this time. Idk if I did ovulate or about to but it was around my fertile window.