HELP! My gag reflex...

I'm 23w pregnant and my gag reflex has gotten so sensitive out of nowhere! When I brush my teeth, I'm okay for about 10-20 seconds, but then it just goes crazy! I had a lot of trouble brushing my first trimester, but it went away. I was doing fiiiiiiine for weeks, but idk why brushing is bothering me again. I tried switching toothpastes, but it didn't help. I've tried brushing without toothpaste, but I still gag like crazy. Sometimes, I gag so badly that I almost vomit. Absolutely any ideas/advice will be appreciated! I will try anything!