Help

Hi ladies I started metformin on the 1st of Nov 500mg a day for type 2 diabetes since cd 12 I've been loosing brown discharge when I go toilet and there's been smears on my underwear sorry for TMI I'm now on cd 19 and I'm still loosing it last night ( Saturday night) I lost pink-ish/brown discharge ill attach a pic I'm just wondering has anyone else experienced this with metformin I do have suspected pcos aswell I'm totally confused

I'm not sure about pregnancy I took a test last night and I think I seen a line on it definitely don't have an infection I've got no high temp and it doesn't smell its the brown discharge like I've just finished a period I've never had this before which is confusing I have been getting strange pains/feelings in my boobs since this discharge started

I'm going to do another test either today or on Thursday I did take a pic of the one last night but I'm not sure

Thank you for replying, I'm going to do another test on Thursday I'll be on cd 23 and possibly 9dpo if I have ovulated I'm totally confused

Update.....I done another test from pound shop not sure if there's anything on it the brown blood/discharge/cm has stopped