Lines not getting darker!!

At 11dpo I got my bfp!

This was just after the time frame

I tested with the cheapie first and saw this line so I got other test and then got these one, all these test were in the pm, the rapid result, clearblue and Asda own brand, where all on a 2 and a half hour hold.

So then 12dpo I tested in the morning FMU, with rapid result and clear blue,

When I got home after work I tested with a clearblue digital

So then 13dpo I tested in the pm with a Frer, not really on any kind of hold

Then 15dpo came ive tested again with Frer this time FMU

Now I dunno if it’s getting lighter!

I’ve also tested with a cheapie, which you can clearly see is much darker than the last test I done at 11dpo?

I’ve had 2 previous chemicals but never made it to 15dpo!

Has this happened to anyone before and you’ve had a full healthy pregnancy!!