So about 2 months ago I got 2 platys and a guppy all female for my tank and 4 and a half weeks ago 1 of my platys gave birth, I got to save 4 of them and the other one still hasent given birth. And when I got the guppy it looked like it could pop at any given moment because of how big her belly was and still to this day its still the same size. She has never squared off until today. But she has been acting very diffrently today. Her breathing is so rapid it looks like her gills or whatever is called is now a pink orangish colour, she sometimes twitches to a c shape, she sometimes when swimming tilt to her side and also either stay super close to the platys or stay far away from them. And the last thing is that she is only staying at. The top of the tank now. The other fish are completely fine in the tank. - thanks for the help