As it turns out, we were able to salvage that 8/21 transfer date, which is 15 days after the hysteroscopy yesterday. The doctor who performed the hysteroscopy yesterday seemed to think that the distance between procedure and a transfer was fine as long as it was more than a few days. So there's less healing time than I'd expected. And we won't have to wait 8 weeks, I'm very happy about that.
Anyway, thanks for the insight. I hope you're enjoying your beautiful boy, I know you are!