Does anybody know about when the doe's belly drops low and her sides cave in, in front of the hips, so that she looks hollow? It looks like the spine has "risen" or the rest of her dropped away. She kind of looks like a big blimp passing under a bridge! Just wondering if this correlated with any particular time in the pregnancy before kidding, or if it varies doe to doe. (No discharge, a little more bagging up but not anywhere near full, no discharge, and the drop was literally within 12 hours). Thanks!!