My period comes every 28 days with the exception of being late maybe 3 in my whole life by 1 or 2 days. I am on vacation right now and I can't relax because this is the second day my period hasn't come. I always use condoms and check for tears after and never anything, and semen hasn't ever even been near my vagina so I have no idea why. I've been panicking lately and even cried over it because I'm starting to think there is something wrong with me.