im 17 and i turn 18 august 28th and my last period was 02/02/11 and i was suppose to get it on the 2nd or 3rd of this month and my periods have been regular so ive missed it. im 2 weeks late. i took a urine pregnancy test 03/15/11 and it was negative. but i feel its wrong.because i want to mix foods which i never do cause it makes me sick, im tired alot, my boobs are enlarged, the circle around them is darker, i urinate more frequently, and im kind of moody,i get pains in my lower stomach nothing severe, my back hurts alot. my cousin took a urine preganancy test and it was (-) but she was pregnant and had all the same symptoms i do. she felt my lower stomach and felt hers and said they felt the same so she made me feel it and i thought so too. is it possible im pregnant because i have all the syptoms?