My last period was weird. It started around the same time that I expected my period except on the first day, it was really dark and lasted not even a couple hours, I had also gotten cramps , like I usually do so I thought it was my period. Than the following three days had brownish bllod like spotting. Unsure what is going on. I m 20, and I do have unprotected sex. I also took a hpt and got a negative.