Stall in line progression?

Hi everyone! These tests are from 13 DPO to today, 17 DPO. They were all taken at the same time each day. I tested positive 9 DPO and was getting good progression prior. For the past few days I feel like it’s been stalling. I know a lot of people say to stop testing, but after a chemical with the last cycle, I’m petrified! These are definitely much darker than when I had my chemical, but I’m still nervous! Anyone have a similar experience? Is it the tests?