i have an irregular period ... my period sumtimes doesn't show up for 3 to 6 months ... the last time i had it was around may 22 and before that i was starting to get my period more regularly like every 2 months ... and now i am goin to 5 months without it and i've been with alot of stomach aches and lower back aches .... sometimes i get tired over nothing and somtimes i feel nausea with headaches ... i am 17 and my period started when i was at the age of 14 ... i hav un protected sex with my boyfriend sometimes but he pulls out ... please help me ... do you think i am pregnant ?