I still haven't started my period by cd 35 so much dr wanted me to have a blood test done. We'll that very same night I started my period. It was real light and dark brown. That was on Tuesday. Wednesday was pretty heavy flow. Thursday was light, Friday was spotting and now today is Saturday and I'm not bleeding at all. I never had bright red blood. It was almost the color of dark coffee grounds. I did pass some tissue Wednesday. I just didn't know is there was a chance for the blood test to be a false negative. And I'm worried why period was so short. Any input would be appreciated. Thank you.