Is hcg rising on frer? Opinions

An

These tests are about 9 hours apart in the same day. The test line stays the same shade but the control line is getting lighter. Does this mean my hcg has risen in those 9 hours from morning to afternoon or you can’t tell because the test line has maxed out its pigment? My hcg lab test yesterday was about 4100 btw. 5w2d