my period is really late and i am showing signs of being pregant :(

Okay so needless to say i think i am pregnant. my last cycle was shorter being only 20 days and it is usually longer about 28-30 days but now i havent had my period in about almost 40 days. i have been really tired lately and been eating i have been nauseated and actually threw up when i havent thrown up in years. anytime i eat something i feel nauseated and i have to be careful of what i eat becasue i might get sick. my stomach has been having pains and i feel bloated a lot of the time. my boyfriend and i do use condoms but i am afraid that one of them may have broke without us noticing. if anyone has any input that would be great. if i am pregnant then i know i can deal with it (hopefully) but if i am not i know that i am going on birth control. thanks.