HELP! Platies!

I'm so so unsure,
I have two female platies and i have no idea if they're pregnant or what this one spot is that my platy has, i read it and it's supposedly something about pregnancy but she's had it pretty much since i got her (way bigger now) and i've never seen her give birth to any fish. I'm trying my best to save all fry for my other tank and soon big planted tank but my platies just never seem to give birth i have a second birthing tank ready that's just waiting to be used!

The fry is not hiding or showing behaviors of trying to hide. I feel like she's given birth to fry before and they never lived and i didn't notice

Images:

bump* really need help

These are probably younger platies? The reason they a rent getting big is because they are young in my experience I have had less fry with the younger females but when they get older they can have a lot more fry. They black spot inside the fish next to the stomach is called the gravid spot, this spot does indicate they are pregnant and or getting close to birthing.


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