I started out on ortho tri cyclen lo for about three months, then switched to tri sprintec and I had been on it for about 14 months. About 3 months ago my pharmacist told me they no longer carried tri sprintec so they gave me tri previfem instead. At first I only really noticed a change in my breasts, so it didn't bother me too much. But after 3 months of being on it, I got my very first yeast infection and it was AWFUL. My doctor said one of the worst she'd ever seen. So I took medicine until I thought it had cleared up, but it returned 10 days ago and the onset was incredibly fast, which makes me think it never really went away completely. Now I am still struggling to get rid of it with both prescribed pills and OTC monistat. Could the change in birth control caused this yeast infection? Honestly nothing else in my life has changed other than that, so I have no idea what else it could be. Thank you in advance for your help!