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I wouldn't exactly call it urgent. There is no way to tell exactly but if you are really worried put her in a separate tank or breeder box. There's not much else you can do. She'll have them when shes ready.
Sorry I can't tell. I wouldn't say soon but maybe within a week. I don't keep platys Is she acting any different like hanging around by herself or 'pacing' the tank? One thing I've learnt is babies come at the most unexpected times lol. There really isn't anything you can do except separate her from the others. You could always provide heaps of cover and leave her in the main tank. One day you'll find the fry and you can move them them.