Errin experiences

So I been on Errin since sept. If your on it how long did it take your body to get use to it. Last 3 months my period is getting pretty light and going from 7 days to 5 days. I started my period 2 days early I’m usually 2 days late. I’m having less cramps but my sex drive is way down.. please tell me your experience on it please and thank you.