weird period?

PcosMummy♥ • •🄿🄲🄾🅂• 👼🕊• 𝔽𝕖𝕓-𝟚𝟘𝟚𝟘 🌈🩷👶🏼 • 💙03•24👶🏼💙•
I've just started taking metaformin, and the day after my period started but it's very light. It's watery bright ish red blood and mainly just there when I wipe.. also have brown discharge - not an excessive amount. I don't have any clots or any menstrual cramps. I've had this for a week and a half now, confused on what this is. Any advice? Thanks in advance.