What Causes Nausea,vomiting And Breast Soreness After Having Unsafe Sex?

I had sex on the 28 of feburary it was during my fertile week the 1st i had sex again both unprotected and he cam inside me and i been sleeping alot and getting nacious and throwing up but i haven t threw up since the other day i just thought it was the bug but the past 3 days i have been having sore nipples. What could this be ?