Burning... down there

I am almost 23 weeks pregnant. A couple days ago I had a blood scare and they tested me for a UTI that day and it was completely clean, I also know what a UTI feels like so I know that's not what this is. At about 6 am this morning I woke with a really bad, burning/shooting pain on the right lip of my vagina. ONLY ON THE RIGHT LIP. It would stay there for like ten seconds and start throbbing and then it would stop. I went to pee to see if that would help and it did not hurt when I peed. It went away after about 45 minutes and I haven't felt it since then. I thought maybe a yeast infection bc I've never had one and idk what it feels like but I don't itch, it doesn't hurt when I pee and that's the only time it's happened. Has anyone had this? I'm so confused