Not ovulation, but she could be building up to one. I've noticed my females swell for about 10 days before they ovulate. An ovulation is unmistakable when you do see one. Here is a female who just ovulated here on 4/7, I took some pics of her a few days before, and then a few hours before. Maybe these pics will help someone
on 4/4
on 4/7 a few hours before her ovulation (photo at 10:30 am approx.)
on 4/7 around 3:30 pm, full blown ovulation. Notice how skinny her tail is.
