It could be. There was a person on the forum who recently had a fish who was getting bigger and bigger for months. Finally, they decided to put it out of its misery, and was just about to when they saw that it was having fry! It ended up having 70+ and the story ended happily.That could very well be what's happening with yours.
it did indeed (phew!). When I looked at the first picture it looked just like mine did and I was absolutely convinced (as those that followed it know) that she was really ill.
I'd be interested to know what has happened since the original post