Period question :)

Tiffani
Hi everyone we have been trying for a baby for two years now about 7 Months ago I went to a doctor and got diagnosed with pcos. Then got described metformin. To regulate my period which worked all besides last month I never got it this month I got it 3 days. First day was light second medium blood . Today (3rd day) pretty much gone . Have anyone else experience this or might know what can be happening ? Please