Will this gag reflex upon brushing my teeth go away?

I used to brush my teeth for 5 minutes but lately I can't even last for 2 minutes. I've currently nearly 3 months pregnant by now and recently experiencing this gag reflex. That's a brief feeling that you're going to choke or vomit but don't. I missed taking my time brushing my teeth and then tongue.

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I never had this happened before, just recently. As soon as I start brushing my teeth, within a minute I have to spit out the toothpaste immediately.
Will this gag reflex upon brushing my teeth go away?
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