PT lines getting lighter but now a positive digital?

I had a negative PT on 11DPO. 12 DPO in the evening I took 2 different tests (2 strip tests) and they were all positive. First response FMU 13 DPO was positive with a clear enough line. I tested 15 DPO and the first response line is lighter. Tested again 16 DPO and now the first response and strip tests are so much fainter than 12 DPO (so faint they’re barely visible) but I’ve had a positive clear blue digital say pregnant? I’m so confused.

Top photo is the FR taken 13 DPO with the FR 15 DPO under it.

Second photo is todays tests at 16 DPO. 3rd photo shows them again next to my positive digital clearblue today.

Update - I’m getting HCG bloods done at the docs today…can anyone tell me what would show on them as a good sign or possible sign of chemical in terms of HCG levels?