Is my Molly pregnant?

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Hello! About an hour ago, I got what I believe is a female black sailfin Molly from the pet store because I wanted a new addition to my Molly tank which had only two. When I got home, I noticed she was a lot bigger than my other two. Could she be pregnant?

 

[fluttermoth]

You can assume that all female livebearers are pregnant, all the time.

She has a while to go yet though, as she's not very big. When she's near to giving birth, you'll see her develop a more boxy, square shape to her belly.