itchy Vagina after sex please help

Last weekend me and my boyfriend had lots of sex, and we also used protection only once that night, but the other times were raw sex. Two days later I began to have sort of a slight or not so bothersome itch near my vagina hole. Once I discovered the itch, I started examining everything I did and used. I noticed that the towel I use to dry off with after my shower would make me itch even more and the pajama pants I wore to bed did as well. Once I stopped using those materials, the slight itchiness stopped and now only feels itchy off and on. I told my boyfriend about it, and he told me that he actually was itchy around the head of his penis for two days after we had sex. He thought that it was poison sumac that he had came in contact with days after we had sex. I am not smelly, nor am I experiencing any burning sensations when urinating. I also long white discharge, but I am not sure did have to do with me ovulating or some sort of infection.

What could this be? It is not a STD because my boyfriend has been tested already. I should also add that I have more frequent UTIs more so than I use to because I am sexually active. Could this be some UTI or Yeast Infection? does sound like my PH balance is thrown off?

I will be seeing a doctor soon

itchy Vagina after sex please help