Line hasn’t gone much darker. Should I be worried?

Hey ladies. I got my first positive test Saturday, then I took one yesterday morning, and again today (Monday). My line doesn’t seem to have gotten much darker which has me worried about it being a chemical pregnancy or something. Does it look like the line has gotten darker at all? Top is from Saturday, middle is from yesterday, bottom is from today. I’m 11/12DPO and my period is due Wednesday.