Smaller eggs tend to incubate and hatch faster than full sized eggs. Day 19 is very typical for pullet sized eggs and bantam eggs. Not that it came from a pullet rather the size of the egg. Pullet egg by size weighs less than a Small (i.e. pullet, small, medium, large).
After many hatches I STILL geek at hatch day.
If those are small pullet eggs or bantam then your right on for temperature. If full size eggs you are likely a tad high on temp for them to pip on day 19. I've been using the same thermometer since the second year of hatching. Through trial and...