Cycle day 72 and no positive yet.

Brittani
I'm starting to think I'm siking my body out from having a period.  I'm so confused and nervous.  All of my pee test say negative.  I went to doc for a blood test but I have to wait until Monday to get the results.  I pray it is a positive, if not I'm not sure what is going on.  Can anyone give me piece of mind and help me calm down?