Why isn't my balloon molly fish giving birth?

I have a female balloon molly and a male. I've had the female for longer, and for a while she's been looking pregnant. Incase you don't know, balloon mollies are livebearers so they do not have eggs, instead their babies are born alive. Well, she's looking squarish and her anal hole is very open (which is meant to be when they are pregnant) and she's pretty fat (although female balloon mollies always are) but I've heard that balloon mollies are nearly always pregnant since they can store sperm but it's been months and no babies. In the time we've had that female, our female platy has had like 3 bunches of babies (they're also livebearers) I really want the babies to be born cos they'd be so cute, little balloon mollies. Anything you tihnk could be making them take so long (since I think the gestation period is like 50-60 days, and she's looked pregnant for more than that. They could've come out and died I don't know, but she still looks pregant.

Thankyou if you help :D.
 
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