Yeast Infection

So I'm 18 weeks preggo and I guess I've had a yeast infection for some time now. I finally made it to the pharmacy and picked up Monistat 3 after asking my mom what worked best for her because she used to get them all the time. Well I just did the first dose and it itches like crazy!!!!!!! I don't know if I will be able to sleep. I looked up reviews and apparently it's super common. Any recommendations to help it stop?! Anyone have success with other treatments?