Cant tell if they're evap lines or not?

Desi

This test I took and it had this right in the time frame and for a while afterwards and i looked at it again today and its gone

This test I took the day after. This is like right after developing, I dont really see anything but family says they do. Nothing there when I looked today.

This test I took today and saw nothing in the time frame and then looked again maybe about 10 or so minutes later and this was there