How do i know if i'm pregnant or not? I've been on the pill for nearly 5 years now. I've hardly missed a period apart from when i went travelling in 06 and i couldnt work out if i was taking it at the right times. However this year i took 2 pill packets after one another which i've never done before because i was going on holiday camping and knew my period was due. Since then though i've not had a period. I've been pretty stressed at work and then this has stressed me out even more. I just don't believe this could happen when i've not ever missed a pill.