Positive digital and faint lines


I've been testing since 8/11 on multiple test! On the 8/11 I did a clear blue digital and got a positive. From 8/12-15 I did the $1 and got faint lines on all there. The on 8/15 and 8/16 I did the First response test and faint lines also. I'm not sure why the lines aren't getting darker but I'm starting to worry