I'm 15 years old and I have 2 addmit I've been sexually active. My last period was on July 9,2009. I didn't have another one until December 12th and that's because the doc gave me something 2 try 2 get my periods back on track but now it's January and my period hasn't started yet. Could I be pregnant or is it just all in my head. I've been having headaches like everyday,I'm getting bigger and I use 2 be in a 34C in a bra now im in a 34D!One night I even told my my that I wasn't feeling to good so she told me to go take a hot shower and lay down so I did and slept for about 4-5 hours,and when I got up I threw up everywhere.I cried and cried because I went to the doctor and they've told me I'm not pregnant and that all my test looked normal so I don't know what's going on with me right now. My mom,boyfriend,dad and sisters think I'm pregnant. Do you? I've feeling this type of twitching noise in my stomach everyday, and my stomach starts to growl when I'm not even hungry but I don't think that has anything to do with me being pregnant though.All i want to know is do you think I am or do you think it's just all in my head? **PLEASE WRITE ME BACK A.S.A.P BECAUSE I'M SCARED OUT OF MY MIND**!!!!!!!!!!!