Positive but line not as dark as expected

Monica

Hubby and I are currently trying for #2. I got a positive pregnancy test first at 10 DPO, which I was very excited about. I’ve taken one test every morning (same time since that, and I’m worried the line isn’t getting darker enough each time. With my son, I feel like my like at this point was way darker. Is this normal?

The top is 10 DPO, middle 11 DPO, and bottom 12 DPO (today)

Opinions please!