ive been on and off birth control for a few months because each pill had made me very sick. the last pill i was on, i started the sunday after my period for three days and stopped because it was making my sick. when i stopped, a few days later i had another period. but i havent had a period this month. i always use a condom, but it might have been possible that the condom could have ripped. i just want to konw is it normal for me to not have a period or could i be pregnant?