Early period

Synthia

So yesterday me and my boyfriend had sex it’s been a week since we have. I can say it was somewhat tougher then usual. The next day i started to bleed like how my period usually is pretty heavyish. Is this okay and normal? Also i am having some cramps like my period as well. We used protection like we always do so I’m not worried that it has to do with me being “pregnant”. I just want to make sure it’s not just me. My period is supposed to come in 12 days.