Went to see the doc today. I was so worried! Fortunately, the seroma was really small. He said that he wouldn't even necessarily have to drain it, but that he might as well because I was there. A small numbing shot in the hip next to the seroma and then he stuck a long needle in and drained out the fluid. It was less then an ounce - which means nothing to me, but he said that this was great.
He doesn't think it will re-occur but said to keep an eye on it. No more appointments until the regularly scheduled one, and no changes to when I can exercise, etc.
What a huge relief!