I have 2 platies. Male= salt and pepper. Female= double bar platy. Well, the female's body will get all big to the point it is almost like a box. So, you think she is going to have fry. Well, the next day or something she will get smaller and I don't ever see fry. Then she will get kinda fat again. I have never seen any fry and I have had her for months. I don't understand why she gets fat and then small so quick. This happends in a matter of days (her getting bigger than smaller), not like a month. So, it isn't the span of her gestation period. What could this be? Oh, and she is healthy. Thanks!