What is this ??

I had Unprotected sex with my bf about 2weeks ago the next day I got my period which was early. It doesn't really have a scent. I had some itching  and burning so I thought yeast infection. I got the store capsules for  yeast infection but it's not going away.   I feel nauseous I get hot flashes especially in the middle of the night and I have really bad cramps .  I had a miscarriage almost a year ago and thing haven't been the same down there .Please help idk what to do or what it is. Std ?!pregnancy ?!help!!!!
 Ugh ??