So about 2 months ago my boyfriend and I had sex and the next day I forgot to buy a new pack of BC, so I had to wait till the day after and I took 2 pills and bought plan B from my school. anyways for the last two months my period has come a week early while i was still taking my active (hormone) pills, but on my break week (inactive pills) I didn't get my period like it is supposed to come during that break week. This had happened for 2 months and I'm worried it will happen again this month. Is this normal!!!