As I said, if you can see a lump, that means there is a joey IP; that would mean that your girl has been pregnant for 4 or more weeks, so your boy couldn't be the father.
Gliders have specific nutritional needs. Yes, the proteins, fruits and veggies; but all balanced out. Specially pregnant females need extra protein so they can provide for their joey. Please look into the diets listed in the link below:
www.sugarglider.com/gliderpedia/index.asp?Diet
These diets are approved diets for sugar gliders that have help them keep healthy for years. The HPW is easy to prepare, they even have a breeders formula which is specifically made for pregnant, lactating gliders; the only downside is that you have to wait for shipping. BML ingredients are easy to get, and I think she provides some instructions as to how to modify it to feed pregnant females. The links are below:
www.critterlove.com/food--sides.html
- HPW
www.angelfire.com/nb/sugarglider/leadbeat.html
- BML
Please be prepared for joey rejection. Suz website describes what materials you need and how to set it all up. You can also ask here and people with more experience could help you. And do all you can to change their diet, right now their diet is not very good and their health could be compromised, specially momma glider and joey.
One more thing, if your male is not neutered I would recommend you neuter him soon. It could help making him less aggressive, plus it will decrease the odor, and the biggest fact will be that you won't have undesired joeys. Even if you want joeys, it is not recommended to breed glider that don't have lineage because of health issues and more.