I set the eggs from our hens on april 19, early evening. Probably around 6pm. I've been candling each night. Yes yes, i know i know, not good protocol. I've been washing my hands, and there are only 3 eggs. We had veins on day 3 and from comparing with a bajillion candling photos from other sites, by day 7 (april 26) i was pretty sure the chicks were on day 8 of development. Once i made the switch and put them a day "ahead" pictures and descriptions seemed to line up pretty darn well. My question is should i rely on the eggs or rely on the calendar? Should i go into lockdown tonight (day 18 by projected development) or tomorrow, which is day 18 by calendar? Are there times when eggs arent giving any "signs" (rocking, chirping, etc) and people lock down on day 19?