having period on pill

is it possible to have 1 or more periods on the pill if you are pregnant? or has it happened to anyone here? i have been feeling nauseous and really tired for the last few weeks, and i have noticed that I am running to the toilet far more often that i was. My last 'period' was about a day shorter than usual and light (though they usually are light for me anyway).. I keep thinking i am pregnant but when i got my 'period' i thought i was just imagining things but last night i started feeling sick and completely exhausted and today i feel crampy and have been having headaches and sore eyes through the day. I prob should just get a test done but could i just be taking the flu or something ?! thanks!

it is possible to get pregnant while on the pill and the "period" might have been either withdrawal bleed or implantation. Do a test and you'll know one way or another.