Lines getting lighter?

I hope this doesn’t get deleted as I am well aware these are positive tests, but my concern lies in miscarriage. Hoping to hear others experiences. On April 29, I had a positive pregnancy test. But verrry faint. I took a few to confirm and went to the doctor for a BETA. MY beta was 5 on April 29, indicating SUPER early preg. On May 1 early AM, I had a repeat HCG blood and it was 27. I also took a few tests this day and they were incredibly dark. I retested today (May 2) as I’m feeling anxious (I currently have one child and I had a very complex pregnancy and post partum due to many health issues). Today’s two tests are much lighter. I have done multiple others of the cheaper ones over the course of many hours to see if they change, and they are very very faint - much more faint than these tests. Like the first tests I took before getting 5 on my hcg bloodwork.

Has anyone experienced this and had a successful pregnnacy? I am getting bloodwork repeated tomorrow morning but I am feeling like the only outcome is a sad one.