today i bought fish at a store and when i got home i noticed there was one baby in the bag with a female and male. i dont seem to see a dark area in the gravid spot and i dont know too well what a fat platy is becuase i just got them today. how can i tell if the female platy i got today is pregant or the store put in another platies baby in the plastic bag?? also this is my first time to have pregnant fish i am not too sure wut to do. and how long does it take a platy to deliver all her babies?? plz help me! thanz