based on the pictures, it is a platy... to answer your last question, you cannot... but you will know, when they get bigger and rounder that they are almost if not ready to drop their fry. make sure you got spare tank with floating plants to isolate your female when she is huge enough. make sure you will use the same water as currently as the tanks water that she's in, to minimize the stressfulness. feed her live food for fast development of her fry, then cover some part of the tank to avoid stress... wait for a few days.
Hope this helped!
Ronn
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