We are on day 21 Almost day 22 starting at 4:30pm. i am left with 4 out of the 8 eggs we started with.. a couple had blood rings and one wasnt fertilized and the other i accidently cracked on day 12. With the 4 we have left 2 are completly dark when candled, doesnt seem like theres an air sac at all now. the other 2 definely have an air sac still. Ive noticed no pipping, no chirping and no movement. Whats going on witht hem and when should i completely worry about the babys?