Parents must be informed immediately of a pregnancy, and any delay is a Bitul Aseh of the 5th commandment.
Furthermore, everyone should have their parents’ Reshus & blessings, to call any time day or nite 24/6 as soon as the baby is born. Every parent & even grandparent will only be too happy to be awoken during the nite with such wonderful news, and once Reshus is sought, no issue of Gezel Sheino. What an awful thing to await the arrival of daylight to inform a parent, and not call inmmediately.