Not a test but I need help! Plz

So out of no where for the past 3 days throughout the night I’ve been getting bad heat flashes and then waking up in sweat. and also have been waking up feeling nauseous.

I found this, but idk if it’s reliable (just like anything else you read on the internet). I’ve been BD ever since my last period and currently just doing it to do it, but I’m just so frustrated and confused... 😢 i just know if I get a BFN I’ll be torn. Especially with people telling me that it’s a big possibility that i am