Plan B and my period

Okay so I had unprotected sex and took a plan b. I had some heavy bleeding two days after for about a week - kind of like my period (I had my period about a prior to intercourse). My period is now a week late and I’m scared. I did two pregnancy tests - both came out negative - but I’m worried about my period now. What do you think I should do ? Should I go see my gynecologist or see my doctor ?