'12+ months on microgestin and just started getting period a day early when I normally get it 3 days into my iron pills. I've been on microgestin fe 1/20 for over a year now. 2 months ago and this month I've started my period a day early. This last month I have been taking amoxicillin and continued to have sex. This morning I woke up to bleeding when I still have one more day to take my active pill. Is this normal or should I be concerned?