Does this look like good progression?

My period was due either yesterday or today. I tested last Saturday with a first response and got a faint positive.

So I tested 11/27 and today to see if the lines are getting darker. I know HCG should double every 2-3 days. Looks like they are getting darker. Does this look like a good progression with the lines getting darker?

To add: I have a 3.5 year old and I had a miscarriage right before I got pregnant with him, so I tend to worry about having another MC. I should be 4 weeks and 3 days right now.