I'm 14,and i think i might be pregnant but im not sure?

Well, i know it's stupid but me and my boyfriend have unprotected sex a lot. I understand Pre *** can get you pregnant, but we always pull out, i've been experiancing cramping . really bad cramps, but they come and go. I'm hungry a LOT. and , i've been so emotianal. i had a period, but it was shorter, not light blood, it was dark heavy , i've been Having lot's of more discharge than usual. i havent seen much a change in nipple color or peeing. i dont have morning sickness, but i do get headaches . and i've been very horny lately. by the way , i've had unprotected sex since i've had that "period." , and , the cramps are just the pretty big sign and , sometimes al get a little dizzy , do you thinkit sounds like  i'm pregnant ?