I always count the day set as day 1 and my eggs always seem to hatch on day 21... I set mine on the 14th and first one was pipped this morning.So, when you're counting your incubation days, remember Day 1 is 24 hours after you set. For example, I set on the Thursday evening of Feb 13th. So the day 1 mark for me was the evening of Feb 14th. Another easy way to remember is that Hatch Day (Day 21) will always be the same day of the week that you set. I set on a Thursday, so my hatch day is a Thursday (late on a Thursday...right now actually!).
I used to count the day I set as day 1, and then get really freaked out when eggs weren't hatching. I was so relieved when someone corrected me.