No I have never had unprotected sex but recently i got something like a cold sore maybe in my mouth and also the bottom side of my toungue hurts. Its probably not cause of this though.
I think you're safe. Stomach pains could be numerous things. You could be ovulating, beginning to menstrate, gas, getting constipated, or diarreah. Also, your vagina hurting, definately could be a yeast infection. Those SUCK royally. I'd rather have my period than a yeast infection! Also, yeast can be giving you those stomach cramps. It happens to many women including myself
Best thing for you to do is test if you are worried. An STD effects where contact has been made. Have you had unprotected sex?