Will She Explode?

Vandibuilt is my female platy, and she is about to have babies. Her black spot ( the babies' eyes) is really big, and so is her belly. She looks like she'll explode! Pat, one of my male platys, is really stressing out Vandibuilt, so maybe that's why she is so fat and hasn't had her babies. I don't really know... I don't think I ever will!