Pregnant?

Last Tuesday I had unprotected sex with my boyfriend. He pulled out before finishing. Thursday I went to the gynecologist and she told me to take plan b. I did. I'm starting to get worried because my period I'm due for my period tomorrow. I'm almost always early or right on time. Idk what to do. I'm thinking about taking a pregnancy test but my boyfriend thinks I'm overreacting. He think the plan b is messing with my period but I'm not convinced.