Positive then a negative??

Question

My first pregnancy test I took yesterday had a clear second line and I took another one today and it showed negative?? Why?

Answer

Was it a blue dye last night then a red dye today? I only ask because the cheapie blue dyes are the worst tests ever. There is almost always an indent/evap line present which leads people to believe it’s a second line. 
I would test again tomorrow with first morning urine and a red dye test

Answer

Might have been an evap/indent

Answer

Were they both done with fmu? Or a 4 hour hold?

Positive then a negative??

The Top Baby Tracker App: Embrace New Beginnings with Tender Care

The Top Fertility Tracker App: Your Path to Achieving Pregnancy

The Top Pregnancy App: Nurturing Your Journey to Motherhood

The Top Period Tracker for Empowering Your Menstrual Health Journey