Pregnancy test not darkening

Hope

Has anyone not had their pregnancy tests darken over a few days? I just found out I was pregnant on Sunday and I went and bought a bunch of cheap tests to make sure the line gets darker until my appt next Monday.

They are the 88 cent tests so I’m wondering if they really don’t get any darker?? Or maybe sometimes it takes a while? It’s making me nervous.. I’ll probably go buy some more expensive ones later to see how dark they are.