Evap lines.

Missie

Can an evap line show up before time is up? I have taken several tests that start showing a colorless line before time is up. They have all turned purple eventually. But it may be a couple hours later. I think I am 12 DPO today. 6 DPO I had spotting for 3 days so I am a tad confused. I have used FRER and Walmart cheapies