Could I be pregnant?

I am 19 years old. For the last two months, my period has gone from a 5-6 day average to a 2-3 day average and now I am a few days late. I'm always tired, I get horrible headaches that last for days, I've been spotting, I'm constantly hungry and...

thirsty, and my clothes are getting tighter. I am asking this because I have taken pregnancy tests in the past that have come up negative, when I've ex[experienced some (not all) of these symptoms. Any advice would be great.

hmmm that all relates to period symptoms... you could be gettin irregular periods... Go to the doctors and see whats going on. Birth control makes you that way too.

your probably not pregnant but go to a doctor just in case

Your not pregnant, cause if you were, you wouldn't be having periods at all.
I have a sister that is pregnant and already had a kid. Don't worry, your not pregnant.
probably just the signs of irregular peroid.
and the whole tired thing, try sleeping more.
(: