don't read and run if you might have an answer

Does anyone know why I would get an extremely Faint positive not using first morning urine then a clear negative the next morning with FMU? I'm still 5 days away from my period so I get its early and I will try testing again in a few days but has anyone else had this happen? What was your outcome? 
Ps. I used the same brand of testing. I used the curved handle first response and it came in a 2 pack so both came from the same pack.