What happens next?

How to take care of baby platy fish
Be on the lookout for pregnant fish.
Pregnant platies are easy to spot, so if you keep a close eye on your fish, they shouldn't be a surprise. A pregnant platy will develop a noticeably swollen belly.

OPT:
(1). It's also common for a pregnant female to develop a dark spot near her back fin. This is caused by the eyes of the unborn fry pressing against her scales.
(2). This is commonly found during the first few months of their pregnancy. When walking up to a pregnant fish, keep your face away from the fish.
(3). They should also have a yellow-orange-tinge to their flesh. Other signs to watch out for include pink gums, dilated eyes, sunken eyes, blood in the water, even yellowish or cloudy skin on the baby.
(4). Additionally, no one else will be looking at it if you are not specifically watching it. If your baby is not already pregnant, it will need special medical attention (cbt) to see if it is pregnant or not.
(1).