So earlier today i had sex and afterwards there was some pain and i went to the bathroom and noticed pink tinted blood. Later on I noticed that the bIood darkened to a red. m supposed to start my period tomorrow, so I thought maybe the sex triggered it to start now? There is still some slight pain present. Update: throughout the night I couldn't sleep because of cramps so i took some midol, it helped a little and i went to sleep about 3:30am. Its 10am now and im still having cramps and i feel as though im going to throw up. This has to be just the period and im just paranoid that it had something to do with sex.