Ok i lately have feelings of nausea, headaches, slight stomach pain, fatigue.. o and my periods... my one before my last was all brown which i heard is natural.. n the one after that it was to me slightly light but heavy first two days and next three days it was very light...i dont know what to do.. i tried to take a test i mean a blood test and see if it could be... but im 21 and very paranoid.. and i need help beefore i run to this doctor... also i have been very constipated..friends think i am... but the test have been proving to be negative on the home test