look in her belly, on the very back of the swollen belly you will barely notice a gravid spot. its hard to see sometimes but its sometimes right above her anal fin. this is a blurry but nice example of mine:
Now excuse for only showing halve the fish and for extreme blurry pic but if u notice the black spot on the back of her somewhat white belly u can see all of those little buggers in there. and if this is the case then watch out because bad water conditions can cause still births and pre mature little guys.