The best sign for ovulation is watching for the swelling. They'll look like they ate a huge meal even though they haven't. Also many but not all females may start going off food around the same time.
Some females may lock multiple times and not ovulate.... Or in the case of a girl of mine this year....
Lock, ovulate, build and then reabsorb. TnT
You were able to feel around 6or7 bumps in her belly and then she went into shed again and they started getting smaller.
Aside from that... Sthe other behaviors....
Have yours been eating regularly or have they been more hungry?
Have they been hanging on the cool side? Bowl wrapping?
Sometimes they'll lay upside down too....