First time hatching. Day 21 was Sunday, March 31st. Eighteen eggs. Candled at 7 & 14 - all were good although some are darker eggs and couldn't quite see. One chick hatched on April 1st and is doing fine. Water tested the remaining 17 and all 'pass' as fully developed but not rock and rolling. Temperature was down for awhile on day 14. The rest of the incubation process has been uneventful. My question is: How late is too late? I've read to wait a week over hatch day. Does anyone have any thoughts or suggestions? Thanks!