Could Delayed Periods Be Due To Missed Contraceptive Pills?

Hello, im on junel fe' birth control, & last month i missed four pills, and didnt mind taking them because i was so behind, and the month that just passed (December) i took all my yellow pills, missed a couple but took them late of course, & by the time my brown pills reached, i didnt start my period.. i never missed one, i called a pharmacist & she said it will probably come late, but no, i totally missed it. So idk if its stress that stopped it? or if its pregnancy. i need help, im worrying myself way to bad. :l oh & i would always take my pills at weird times, some times in the morning when i was supposed to at night, or in the afternoon Blah please help me....