Bloated Pleco

Here's my 3" Clown pleco all bloated... not sure what's wrong with him/her... his/her scales are not protruding outward as would be indicating a fungal infection... scales and fins look very healthy actually - color is good and fins show no fraying or deterioration typically seen with a sick fish... could this be a pregnant female??? At 3" I thought this fish was too small to breed. I do have another standard pleco in the tank (not a clown pleco...) that's over 8" long... is it possible he may have bred with this little clowny?