Faint line on FRER during af?

[Spri3]

Hi everyone! This is a bit a long one so I do apologise..

I had a 3/4 week long period last cycle (I do have PCOS) and AF returned again 3 weeks later on the 5th of August.

Something has just felt off, so I decided to take an OPK and it had a very dark line! The darkest I have seen over the past few months as I don't get positives.
So anyway I decided to take a first response yesterday and it had a very very faint, but pink and visible line. I took another this morning and the same thing just a hint darker!
OH could also see this, I have tried to take pictures but it's too light to be able to pick up on camera.
I'm just left feeling so confused as to why there would be super faint lines on a test as AF is in full swing!

*Tests taken the day before AF were stark white negative.

Today's tests.

I'm sorry op I can't really see them. It could be a chemical pregnancy. Wait a week and do another test.

Have you tried a different brand?

Are the FRER from Amazon? So many people including myself have got faint positives on them recently xx

I had faint positives on 2 FRER’s and wasn’t pregnant. They are becoming quite well known for this unfortunately x