[Thamnophis]

Hi Jan, pretty babies she has given you.
T. a. atratus is a great snake; I also have a couple.

The delaying of birth is something that happens so every now and then. I know it from Pantherophis guttatus and other ratsnakes. They can stop giving birth/laying eggs when they are disturbed.
It looks to me a normal phenomenon that probably also will occur in the wild.
It is a way of protecting the young/eggs when a predator is around.

Greetings from your neigbouring country...