How can i know for sure my sugar glider is still pregnant?

A sugar glider female has one (19%) or two (81%) joeys a litter. The gestation period is 15 to 17 days, after which the baby sugar glider (0.2 g) will crawl into a mother's pouch for further development. It is virtually unnoticeable that the female is pregnant until after the joey has climbed into her pouch and begins to grow, forming bumps in her pouch. Once in the pouch, the joey will attach itself to its mother's nipple, where it will stay for about 60 to 70 days. The joey gradually spills out of the pouch until it falls out completely. The mother can get pregnant while her joeys are still ip (in pouch) and hold the pregnancy until the pouch is available. Their eyes will remain closed for another 12–14 days, and they are virtually furless at first. During this time, they will begin to mature by growing fur and increasing gradually in size. It is about two months for the offspring to be completely weaned off of the mother, and at four months, they are on their own