hehe... I havent seen Ginger for 4 days!!! I came back home today, and she's really really chubby! My question is... do sugar gliders put on weight during the 'having joeys IP' stage? (other than the weight of the joey)

Yes because they have to start eating more for them and there joeys.

[:"green"]Some do & some don't. My Bittah stays tiny even with joeys in-pouch. My Carina seems to chub up a bit. Allira has her first joey in-pouch right now & has gained a bit of weight, but not a lot. I wouldn't be alarmed at your glider's weight-gain unless it's extreme.