Has anyone experienced lines getting lighter but went on to have healthy babies?

I got a positive a week ago. 7 days before expected AF. I even got a positive on digital. But then line started getting lighter. I went to dr yesterday and they said it showed negative on their urine test. They did hcg blood work and started me on progesterone. I took test after I left appointment and got another faint. This morning it’s there but even lighter. No bleeding, no cramping. Anyone experience this and have successful pregnancy? I miscarried a year ago at 6 weeks. This was our rainbow baby due on my hubby’s birthday. Could the progesterone help?