FET - possible chemical?

Hi ladies!

I am 7dp5dt and got my very very very faint BFP on 5dp5dt. From what I’ve seen, most people’s lines have gotten much darker than mine have by this time. I do see some progression, but want HONEST opinions and maybe some feedback from people who had similar experiences?

Note that these BARELY showed up within three minutes and got darker as they dried out. These are also in the light so you can see clearly.

Any input is appreciated!