I would agree that she looks pregnant. How long have you had her? If she came from a pet store surrounded others...she is pregnant. I am more familiar with guppies but know that guppies can hold sperm for several cycles after being "hit" when there are no males around. Would expect the same. Good luck.
Nothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude. - Thomas Jefferson