First timer here. Brinsea mini advance, 7 assorted chicken eggs (the eggs for education set from mypetchicken). I set the eggs on Tuesday morning 2/9. When should I expect the first eggs to start hatching? We suddenly have the opportunity to go on a little trip the weekend of 2/27-28, but I don't want go away and chance missing the little chicks start to hatch. My son has been patiently waiting and it would be disappointing to miss even one of them. Anyone help?