I need realists please- positive not getting darker

Thursday evening (estimated about 11dpo) I took the above test. It took a while to come up and was really faint as you can see.

Saturday morning (just now) I took the below test with FMU expecting it to be much darker. It did show up immediately but isn’t any darker.

I’ve had three other miscarriages this year and now wondering if this is another. I’ve had 3 successful pregnancies and all of them had great line progression. Has anyone ever had tests not get darker but still go on to have a successful pregnancy?