Is this fish pregnant

[Bluereef]

Kk so I have 2 different tetras in a 6 gallon aquarium and one of the tetras getting huge is she pregnant or just fat she really active fish and always eat when I feed her see picture

 

[Smcoyle87]

Hard to tell really. Are you positive that you have both sexes in the tank?
She could just be hogging all the food and getting fat haha.

 

[Wiggles24]

She could be holding eggs