Could I be pregnant,? I need lots of answers please!?

hi my names Ale im 19. Im really worried I havent gotten my period in 6 weeks. Ive been having bad heart burn, cramps, white discharge and I feel nauseous at times but dont throw up also my hurt but on and off. I took a test 2 weeks ago, it was negative. I have unprotected with my boyfriend but he pulls out. I dont know what else to think?