YEAST INFECTION PLEASE HELP

An

So tomorrow makes 12 weeks pregnant and I’m having the hardest time with this yeast infection. It happens literally every time i wear underwear of any sort. My sister is the same way. I tried coconut oil once and I feel like it helped with itching (didn’t put it IN. I used it externally) but it’s gotten to where It’s constantly hurting and itching. Idk what to do considering I’m pregnant. What’s some things that I can do while pregnant to cure this fast?!?