Pregnancy test nerves

Am

So I know I shouldn’t be testing anymore since have had plenty of positive tests and the doctor confirmed I’m pregnant from and early ultrasound but I took one test in the afternoon and it was dark pink for both lines (top pic) and then I took one more first thing the next morning and the line was a little bit lighter (bottom pic).

Could this mean I could end up miscarrying?

I’m almost 7 weeks.