Yeast infection that won’t go away!

I am 12 weeks now but have been fighting this yeast infection for over 5 weeks! I was tested and it is 100% a yeast infection. OB recommended Monistat 7. I completed it and although it gave me some relief the symptoms started coming back as soon as I stopped. OB suggested doing it again but I was nervous with this so I opted to give it two weeks of trying natural remedies. I’ve tried EVERYTHING! ACV baths, probiotics everyday, changed my diet to no sugar or carbs (had to let go of the carb part bc I was dropped weight so fast and not good while pregnant), coconut oil, eating garlic. I finally got desperate and did another round of Monistat but did it for 9 days instead since 7 days wasn’t enough last time. Well it didn’t work again and it’s back full force again. I’m devastated. OB wants to wait till second trimester and put me on Diflucan. I’m TERRIFIED of taking it as I know it can cause birth defects. I’m so anti-medicine while pregnant that I never even took a Tylenol during my 1st pregnancy. I’m at a loss and don’t want to be selfish and take it or should I just suffer through it? I have soooo long to go though since I’m only 12 weeks!