My bitch is expecting her first litter of pups and it is our 1st time breeding. When is it the best time to advertise them ? Thanks in advance

I have 2 gerbils they just habd their first litter of pups April 2nd. However I notice in the past 3 days she has nested them by herself for 1 day, shared a nest with the father for 2 days. Made a completely new nest this morning and left the babies in the old nest, and didnt move them over...