They can store sperm for 5 or 6 batches of young, so even if she is pregnant it doesnt mean that the other one is a male, the "male" just might not be holding babies right now.
there is a very easy way to sex them also:
look at the anal fin (the one below the body in the back) and a males is longer and pointed, (im sure you can guess what that is) while the females have a rounded fin. good luck.
matt
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