Honestly I'm probably not the one to ask. That said, are you sure the mating on June 30th was the one that produced the aborted pup? For over three months of development that doesn't seem very far along. I have also heard of some rays being pregnant for six months, forget what species it was but it was a black ray.
Hopefully someone else with more knowledge chimes in. I could be way off, this is just what came to my mind. Regardless, your leo is gorgeous!