Hi, I m 20 years old and I ve had my period since I was 8 and they have always been relitively normal but I just got my period yesterday and its been really light but the blood is Brown and stringy bits and its making me nervous.. I thought I was pregnant at first because I ve been having symptoms ( nausea, headaches, being tired none stop, and my regular discharge was really thick but it was just a clear kinda white color but I took pregnancy tests and even went to the doctor for blood tests and they all cam up negative what else could it be?