Evap??

Is it possible to get an Evap within the time frame?

I took a test two days ago and looked at the 3 minute mark and I could see like a shadow of a line. Well fast forward to today I went to throw the test away and of course looked at it again (knowing it was no longer good but still wishing it were positive) and the line was more visible so I know I wasn’t imaging things two days ago but I didn’t think evaps could show up during the time frame, I thought they only showed up after?