Can ya help me!!

I'm 12 days late, which I'm never late, haven't had a sign from aunt Flo at all, but past few days, been really emotional, having weird cravings, headaches and been really tired, me and my fiancé did have unprotected sex and then tonight we did and after I went to bath room there was a smear of light light pink tint on the toilet paper?? What could it be