Impending chemical?

I got my BFP 12 dpo. My tests haven’t gotten darker (all fmu) and I am now 15 dpo. I had blood work done yesterday, but being military-affiliated, they take the “less is more” route and I won’t be seen for a follow up unless something goes wrong. It’s also a 4 day weekend so I won’t be getting my results until Tuesday 🙄

Is there any hope? With my son my tests got progressively darker within 72 hours. I know “a line is a line” but I can’t pretend that I’m not worried.