pregnant

hi i have a question.me and my boyfriend have been haviong unprotected sex since feb.26.2007. and i think i am pregnant?but i took a pregnacy test on may 8.2007 and it came back negative..but i be getting pregnacy signs and stuff. lately i bee n having sharp pains in my sides,and throbbing in my abdomen area, feeling nausea,headaches,tender breast..but i want to get pregnant.but not know i mean if i am the nthats good but if im not thats good too..i just dont know what to do..should i take another pregnanct test..can you please help me cause im soo lost