Yeast infection that won't go away!

I'm a nervous wreck and so distraught these days. I've had a yeast infection for 3 weeks now and am so miserable. My OB told me to take Monistat 7 and that is the only thing I can take while pregnant for it. I finished the Monistat and the yeast infection never went away. I'm a nervous wreck because I've been reading how Monistat is a class C drug during pregnancy and does come with some risks like birth defects especially if taken in the first trimester. When I went in to see my OB she just suggested that I continue on another course of Monistat but idk how safe it is to do two back to back courses? This past week I've tried every natural remedy I could think of to get rid of this thing and NOTHING has worked. I have been taking a ton of probiotics, eliminating sugar and most carbs, apple cider vinegar baths, probiotic suppositories, coconut oil. Most days I just break down and cry from the stress and guilt that my baby might have something wrong with it because I know I will probably have to do another course of Monistat now and I feel like there is no other option and I'm only 9 weeks along. Also there is no guarantee that it will go away with it either as it didn't the first time. I hate that I have been injecting so many things into my vagina and it really scares me. Does anyone have positive experiences with chronic yeast infections and multiple does of Monistat esp in the 1st trimester and baby was healthy?