PCOS metformin newbie

I have not had a period since February and recently started metformin beginning of May. I have no idea of knowing when I ovulate (I have small follicles hence started metformin) so I don’t know I have pregnancy symptoms or metformin side effects 🤷🏼‍♀️ How long do you think I should be taking metformin before taking a pregnancy test? My mom and sister never had strong pregnancy symptoms so I don’t want to wait too long to take but also don’t want to get BFN. My nipples have been sensitive for a week or so, I have weird dreams, and now lotion- like CM. TIA 💛