Line getting lighter?!

Mrs
I took a few tests yesterday...ok 7...6 line tests and one digital...all 6 line tests we're faitly positive line was Def there just light 3 we're I'm the am very faint the other two were after 3pm and one at 7 all positive...took a digital around 4ish not pregnant...then this am I took another frer with fmu and the line is there but lighter then the one I took at 3pm yeaterday. AF was due thursday. Should I be worried?