Confusing BFPs

 This is going to sound strange because everyone always says test with fmu but since I got my first BFP this month I have tested multiple times to see if the lines get darker and they are always darker at night than in the morning. I broke down and took a cb digi last night that said pregnant 1-2 but this morning was negative. I had a MC in June so I am paranoid. Has anyone ever heard of better tests at night?