I have bought the first response ovulation tests and they are not making even the faintest test line.

I have used test strips before this and I always get at least a faint line.

I’m so confused if these are faulty or has anyone experienced no test line followed by a positive at ovulation time??

*****I have used the strips and I found much better success but I need advice on those that have used first response and getting no or very faint lines that eventually disappear after a few hours****

I’ll attach a pic of my tests