Is my molly fish pregnant?

[Mollytank101]

I need help. I just added this fish into my tank less then a week ago. She/He seems way larger then our black ballon molly. Please help! If she is when does she need to be put into a separate tank? Anything I need to know?

 

[JuiceBox52]

could you get a better pic of the anal fin? it looks to be female, and will almost certainly be pregnant if shes been with males any time recently. It's hard to tell with balloon mollies