Do you think it’s looks lighter the last pic (with blue background) ? The test with white bg is taken on monday and todays test is the last picture (blue bg)

Does todays look lighter than the one in monday? I personally don’t see a difference but as 2 days passed my hcg should have been increased and show better than monday one. I had some brown spotting yesterday and today

and it’s good if it looks the same ? should i be worried i mention there’s 2 days apart from these tests and hcg should be double and show more positive than the one on monday or not ?