You can see the round yellow object at the left of the picture on the right. This object was the base of the female flower. It will probably drop off in a few days.
However, all is not lost. There was another female flower that blossomed a couple days after the first flower. As you can see in the picture, this flower is growing into a nice little pumpkin. I need to wait a few more days before I declare success, but it looks very promising.