This is not my first pregnancy and have used these tests for years with no evap line. Usually when it’s negative,

I see ZERO evap line and I always check the results when the tests says to do so. My tests from this pack have had this same line for 4 days now (you can see my previous posts from this week)…It does not get darker but it always shows up. I used these 6 months ago from the same batch and didn’t see this issue. They do not expire yet but I tossed them out. I bought a new batch. I’m wondering if letting the bag sit in my bathroom over some time caused them to have an evap line all of a sudden? Like humidity?