Hmm,
I'd say that looks more like a "build" than full ovulation - but being glued to the hot side is a good sign.
If she were mine I would probably try palpating to get a feel for what is going on ( there are videos on youtube and a t-shirt can make the process easier ).
The difference you are feeling for is that follicles are hard and relatively easier to feel where as eggs are larger but squishy and can be hard to distinguish.
If she has ovulated the eggs will move closer to her vent as laying time is close. So when her back third or so is swollen, round, and generally being found in wierd contorsions it is time to fine tune the incubator.
del
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