Heeeeeelp

Ive had my mestrual cycle already (05/6-05/11)..... Than last saturday afternoon i started spotting...its not my regular or usual period is more like on my last day type of period i mean i dont even need a path or tampon since the amount is so small n uts pink n browinish st times...now i took a pregnancy test its negative... According to glow am not due until next sat for my period... I have been having all the pregnancy effects(nasue, back aches, headaches,dizziness, sore breast, ect) what is my body doing????!