Is my Mollie pregnant? I thought she was but she hasn't had any babies?

[Placroix29]

I'm kind of new to raising mollies I've had them for about 2 months I moved them from a 5-gallon smaller tank because it's already cycled and I thought she was going to have babies and I would put the babies in the smaller tank until they got big enough. I put them in a 25 gallon tank where there's another female and a couple of male mollies they have a few other tetras and couple sword tails etc..as tank mates I thought she was pregnant because she's so big. is it possible that she's just not having babies because she's too stressed out? In these pics the first is when I first got her and then now.