Did any of those hatch? They don't look too hopeful for day 18 or 19. But a couple of them do have nice veins. Still, if Sunday was day 21, they should have hatched long before now. You probably want to get an additional thermometer/hygrometer to check the temperature and humidity of your inc'y...
Hello, if your incubator ran a little cool, it's possible that they won't pip and hatch until day 22, though you'd expect to see some pips today. And 38 Celsius is 100 Farenheit, which is a little warmer than I run my eggs, so it's possible your temp gauge is off.
I lay my eggs flat to hatch...