by the way my platy first batch of fry she had 20. so you many end up with lots. and they are hard to see too. the only reason why i realized that my platy had, had them was because she was getting slimmer again. but yea that white gets bigger and then you will have fry within a week or two. the biggest sign is that she will hide from everyone in the plant area to give birth and she will stop eating and start heavily breath.