Is my platy pregnant?

[ChrisPduck]

Hi guys.

I've recently brought 4 platys and one has started to mooch around at the bottom of the tank out of the way of the others. I've noticed it's belly is quite big, could it be pregnant or something else? Thanks in advance.

Chris

 

[emeraldking]

Welcome to TFF to start with...
From these two pics I can not see whether it's a male or female to start with. Could you make a better close up from the side where we can also see it's anal fin?