Not sure what to think...

I took this test just over a week ago when I was just turning 6 weeks, the line was really strong and going good, I was so confident about my pregnancy!

Today I felt the need to test again to make sure everything has been going well, I'm exactly 7 weeks I have my first US next Tuesday. I've been really ill recently, extreme nausea everyday all day, I'm kinda sure I caught a bug (although it seems to be slowly disappearing now) so I had that alongside morning sickness. But it's kinda got me worried with the fact that the line has definitely gotten fainter... I haven't spotted or anything.

Has anyone else had this and everything be ok?? I'm starting to get worried... 😞 here are the originals. 6 weeks top and 7 weeks bottom.