Hydei have a quirky life cycle where if I remember correctly only females emerge for the first several days to a week. If you pulled flies from this period, then you are getting unmated females (as they don't mate until they have been out for a few days). THis is why with hydei, I try to look at time from emergence as a risk factor.
I'm not sure that a swollen body is an indication of the presence of eggs.
If there were a bunch of larva in the media, they prevent yeast overgrowth by churning the media and secreting digestive enzymes. This is also an indication that the flies weren't depositing eggs for one reason or another.
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