Lots of good signs there. I bet it's one of two things, you either saw building rather than an ovulation so she will shed and ovulate in a few weeks, or you did see an ovulation and she is just slightly off on her shed and you'll get eggs in a month or so. People often mistake building for an ovulation when they first start breeding but once you witness a couple ovulations you'll know going forward. Also, they often look thinner after ovulation and people start second guessing.