Just wanted to let you have a little ease of mind, My 1st hatch a couple weeks ago I was so excited that I added 8 more eggs 3 days after I set my 1st 18. I only had one incubator, so I figured I would just lock them down all at the same time. Which meant the 8 eggs would go into lockdown 3 days early, on their 15th day...all but one of them hatched! In fact, in Storey's Guide to Raising Chickens, she claims that eggs do not need turning after day 14. I would assume it is because they are so big by that time-they don't benefit from being turned as the reason for turning is so they don't get stuck in place.