Its not necessarily common, and the shedding schedule of a gravid female is normally the same, but I've had them shed twice after ovulating, ovulating in shed, shed a few days before laying. With live animals, nothings guaranteed such as schedules on which they do things, as much as we want them to be.
Damn, they seem try really hard to make us tearing our hairs out
But, anyway..thanks loads for this useful yet unbelievably surprising fact