Take a pregnancy test and found out or wait until tomorrow and see if you get your period. You can take the test up to 5 days before your missed period. Hope this helps. There is a 1% chance this could happen. If you have been taking your birth control as prescribed (not missing a dose) then that is the point of taking it ... so you don't get pregnant. It's highly doubtful you are pregnant. Birth control pills (patches) can cause your periods to become erratic and that's normal. As the above poster suggested, if you are still not convinced then get a pregnancy test kit from your closest drug store.