I have an egg hatching right now and I noticed a drop of blood on the outside. The membrane appears to have some blood on it as well. The chick is progressing and has almost completed the zip. Today is day 22 of incubation and I’ve had 11 healthy chicks so far. I only opened the incubator to remove 7 dry chicks and some egg shells briefly because it was very crowded. Is this normal? Did I do something by opening the incubator?