Annoyed and confused

My boobs usually get sensitive about 8 days before my period shows up, having PCOS it was nice to have that indicator so I knew when to expect my irregular period to come.

My doctor started me on metformin last cycle, which brought on my period after about 12 days. Only had sore boobs for 2 days which was different. But this cycle I've had sore boobs since CD 18 on CD 22 now so it's only been 4 days, guess AF is going to come early this cycle, which would make it a 26 day cycle. I didn't start OPKs until CD 12 because I figured any earlier would be too early but I've been getting but still haven't gotten a positive. I thought the metformin would make my cycles easier to deal with but doesn't look that way 😣