I have been on Microgestin low doseage for a while and then this past month I got moved to a higher dosage and started taking it right when the low dosage reminder pills ended, I'm in to my reminder pills in the higher dosage on first day and I haven't started my period, me and boyfriend have had unprotected sex this month quite a bit because we thought I would still be protected and he did pull out, is it normal to miss your period if you switch from low dosage to high doseage? And in the low doseage I have usually started my period on first day? Is this normal to miss a period? Or is it more likely I'm pregnant?