Why is a pregnancy test not valid after 10 mins?
Why is a pregnancy test not valid after 10 mins? I took a test on Wed one day before my period. I threw out the test after 5 mins because it was negative. I have not started my period and am now 4 days late. Dug the test out of the trash. It looks very positive. I looked up evaporation lines and I'm 99% positive it is NOT an evaporation line.