That’s great news
My guess is your temps may have been off even if the reader said 37.5 it may not have been that warm and can cause a delay
Did you calibrate a thermometer for inside ?
I honestly don’t go by the books like most do
I don’t do day 25 set for lockdown
We shoot for that but I now read my eggs and if I need lockdown early or later then that’s fine
I watch for the eggs to wiggle and rock around , air cell to dip forward and shadowing along the air cell
That’s when I start lockdown
I have had them hatch day 24 to 30
They really do as they want