I know I’m crazy, but what do you think?

I know it’s nuts to keep testing, but I’m super nervous and it keeps me calm. Obviously lines are nice and dark, but when you have nothing else to be nervous about, I’m wondering if my lines should be different over the last 6 days or if these cheapie tests are at their limits. Top one, today is 6w, the later one is 5w1d. I just keep expecting to see some change but there hasn’t been anything, may be a good thing it’s just not getting lighter. I have my appt tomorrow so I’m hoping for some clarity. I really don’t feel pregnant, and scared because of two previous miscarriages.