in need of help

Ok so my "period" came two weeks early and has been going on for almost 3 weeks.  I feel uneasy, tired, cravings for salty foods, always thirsty, back pain, occasional stomach pain but not like period pains.
The bleeding will start when I wake up and be a bright pinky red ( not like my period) and then turns dark brown and just stops until before I go to bed but it's just dark brown.
I'm worried I may be pregnant and have no way of confirming it as I am 17 and have no money which is stupid because if I am how the hell will I be able to look after a baby?! 

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