Should my test lines get any darker?

Hi ladies!

So I am going crazy - bit of back story. I had a chemical pregnancy in October. It was very unexpected and upsetting! I am now 4 weeks and 2 days. I got my BFP at 12 DPO and it was very faint. The line then progressed strongly until 14 DPO where it has since remained as strong as the above pictures. Every time I test now it comes back the same colour as 14DPO. Do you think it should be getting darker or is this as dark as it gets? I thought it would atleast become as dark as the control line. 17 DPO now... am I overthinking things ?