Carrying Eggs Or Ill..?

so i noticed that one of my cardinals is very fat.
Overfed..?
nope, since i hadn't fed them for a few days.
but it looked similar however its a little further back on the fish. 
causing me to think she is carrying eggs.
also she is eating fine, swimming around happily and acting as if normal
 
looked at them again today and she seems more round and maybe squaring off at the back.
and a few others are looking somewhat plump.
 





 
if you'd like a video i have one also
thanks in advanced

I would feed them some cooked de-shelled peas just to make sure the fish is not constipated.

okays