Period, pregnancy?

Is there any chance of pregnancy if I had protected sex 2 weeks ago and the condom slipped off a bit so maybe the precum in the condom made contact with my vagina and yesterday I got my period? I'm pretty sure it didn't make any contact with my vulva because it didn't slip off inside of me, but my period is lighter than usual. I lost my virginity that time so maybe this affected my period? I also started taking the pill yesterday when my period came.