How long is a platy fish pregnant before she gives birth?

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She is obviously pregnant, I just got her from walmart and I have already seperated her from the other fish I would just like to know when to expect the babies. Thanks!

Platies give birth every 3-4 weeks.
If she was already pregnant in walmart then i would say she would due in the week. About two days before she gives birth her gravid spot ( which is the dark spot near her stomach) should be really dark and she would look like a square.
Gud luck!
It really depends when she got pregant but I would say about a month untill she gives birth, maybe a little less.
well it usauly takes three weeks but you dont kno when she got pregnant so probbaly a little shorter like 2 weeks