I went to Vegas and I had unprotected sex with a guy I didn't know about 4 days latter I started to bleed for 3days it was enough blood for it to be pretty noticeable and it was not my period , now it's been about 2 weeks and my vagina just started to get really itchy I try not to scratch but it feels good when I do it reliefs the itch and once I do it gets really hot ! And it's only itchy in the beginning of the inside of my vagina not the lips . What could this be please help ?