Java moss is also good cover for baby fish. We let them take their chances, and seem to get 1-3 platy babies surviving each time, hiding in a fairly small piece of Java moss and under the bogwood. Most of the fish would see them as a snack, including their own parents (it might even be the reason that the male was following her... )
Don't give up completely - if you've got lots of hiding places, you might find one or two appearing in a few days - they're very good at hiding.