Late period

Makayla
So I was supposed to get my period today and it didn't come and I can't really tell if I'm cramping or not.  Keep in mind I have an over irrational fear of becoming pregnant and it's really stressing me out.  I had sex with my boyfriend for the first time ever this month and he came on my chest so I don't think there was anyway of anything getting down there, but I'm still super stressed.