Wunsi - I didn't mean you specifically. Just noticed a LOT of people say sperm or swimmers, when they're really just talking about ejaculate. It's not something one would think about if they didn't have reason to think of them as separate entities.
Sel - funny, my FS said the reason I was ending up with less quality blasts than day 3 embies was probably due to my eggs. I wanted him to say it was the sperm, because it's donor sperm so simple solution - try a different donor. But he doesn't think that's the problem. Well, he doesn't think there is a problem at all - he thinks my results are "very impressive" at age 37. But I find it frustrating to have 9 eggs fertilise, be called at day 3 and told all 9 are still kicking, 6 really good, the other 3 not so much ... and then walk in on transfer day & be told there's 1 to transfer and 1 to freeze. (1st cycle they didn't even freeze any)