Line getting fainter?

Hi it’s my first month TTC, (im new to this so if this is the wrong group I apologise - please point me in the right direction!)

I’m 10dpo today and have had light/moderate bleeding on/off since 7dpo - heavy enough to need more than a pantyliner but not heavy enough to ever fill more than the tip of a tampon.

I took a test 8dpo as the 7dpo was spotting and I thought it could be implantation bleeding but it was negative.

Yesterday evening - 9dpo - I took a test with what I think has a very very faint line?

This morning using FMU I took another test and I can’t even see a line showing up in a picture but I’m sure there’s a vvvvvfl when I look at it in person & my bf said the same.

Could this be chemical or false positive on the first test? AF isn’t due until 18th May. Thank you