TMI periods and thrush?

Since my periods have started back up again PP I’m getting terrible thrush for about a week before it starts and then again after it’s finished. I’m guessing it’s to do with the pH balance but is there anything I can do to prevent it happening every month? Might it be a symptom of a bigger problem, such as my thyroid? Im’a go to the to doctor on Monday but I’d like to go in with some suggestions if possible.

So annoying 😑