I'm only 17 and I'm wondering if these are signs of being pregnant? Missed my period 2 months in a row, but sometimes don't really have a regular period. Back pains, head aches, lack of breath, stomach pains in lower stomach, frequent pissing, very gasy, light headed, mood swings, weight gain, stress, numbness in legs and arms, rapid eating sessions, and always tired. What could this be? I've taken 6 or 7 hpt and there all negitive. Can someone please give me some advice?