Shouldn’t these lines be getting darker?

Kris

Test 1 was taken Saturday , test 2 Monday and test 3 was taken today (Tuesday ). I had a chemical pregnancy 2 months ago and I’m just worried that the lines aren’t getting any darker as the days go by. Period would have been due today, should the lines be getting darker or is it just too early?Also I took a digital test and it said not pregnant.