Help about possible pregnancy?

To start off i am 18. Well lately my boyfriend and I haven't been using condoms and I am on Beyaz birth control pill. Im allergic to latex so it got to the point where condoms started hurting. I have been on the pill since February of this year so it has been 5 months.. I have been taking it like im suppose to but i have forgotten to take pills but i took it the next morning. Lately i have been feeling really bloated and nauseated lately. I've been feeling really tired and have been having horrible mood swings. Ive been eating a lot more than usual and have gained some weight. I have started my period a little over a week earlier than i normally do and its not as heavy as usual. Its more like spotting and also I am getting really bad cramps. I normally dont get cramps since ive been on b/c. Could i possibly be pregnant or could it just be my birth control?