Worried about my tests...

Elizabeth • 33, living in Minnesota, married, mom to two amazing boys
I got a positive test on March 7th and I know I shouldn't be worrying myself but I've been testing since. I feel like the lines are getting lighter. My husband doesn't think so but I need opinions. The top test from Walmart (purple and white one) is the one I just took, the dried one is yesterday's and the first response is from the 7th.