So I took this cheap test this morning and I could see a line on it but wasn't sure if it was a 'proper line' if you want to call it that. I stupidly picked up First Response Rapid Results instead of FRER but tested anyway and couldn't see anything (which I expected). I went out and bought FRERs didn't use fmu but did have a 4 hour hold. I feel like I can see a line in some pics but others I can't really see anything so could this just be the light? All pictures were taken within the time limit.

Cheapie

Frer (same test just different lighting)