I need some answers

I am 16.1w pregnant and for this whole pregnancy I have had this in and off stinging in my vagina on the left side. It comes and goes only when I drink soda or coffee. I’m guessing it’s the sugar. But there’s nothing else. No odor no discharge no itch .. no std. no sti. My dr tested for uti and it was negative. They sent it out for cultural and it came back negative. I thought maybe it was a yeast infection although I never had one and the cream didn’t work and I’ve tried several. It’s just a light Sting when I pee and I don’t have to pee constant like a uti either. Idk what it could be? It’s just annoying. My

Mom said it could just be my body with the pregnancy. :(