Period or Pregnancy?

Just so you guys know, my period comes and goes whenever it wants.
I missed my period for the past two months, this week eve says i should be getting it. I have had some cramps and i have been craving stuff. I just can't tell if i'm pregnant or if it's my period. 
last night i had sex, with a condom of course, but he took the condom off to release on my butt. I cleaned myself up, but this morning i felt a little sick and i don't know if it's my period or morning after sickness.
I'm very scared because my mom doesn't know i am sexually active and she would kill if she even knew. 
I hope someone can help me, thanks. 

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