Evap line???

Cassie • Momma of Three Graci 5-7-15 Graeson 9-7-16 Gabriel 8-6-19! Angel Momma of Two Nov 2015 and Twin B Jan 19 2016!
So i took a Hpt and this has happened three times like the line showed up but then Faded away to nothing making it neg is that an evap??