Hi @LSL0708, sorry for the delay but now I can give you a full update! Out of the 21, we got 10 fertilized, 6 that looked good on day 3, and then 5 that made it to blastocyst stage today. I have had one transferred today! But unfortunately it's not great quality - the grading is quite low, and based on what I've read since I got home I think our chances of it sticking aren't very good 
The other 4 blastocysts are 'slow growers' and they are carrying on with culturing them until tomorrow to see how they do and whether they are good enough to freeze. I would be so pleased if I got even one that was a good quality to freeze tomorrow, to have as a back-up.
I'm feeling a little deflated - but also, I started the day thinking I might not have one transferred at all, so trying to stay positive and thankful! I've been feeling quite ill with mild OHSS for the past few days (quite a lot of bloating and much reduced appetite). I had heard that they often cancel a fresh transfer if you have OHSS, because pregnancy would make it worse, but the doctor decided it counted as mild enough for me to go ahead so I was relieved. Now just taking it easy and hoping for the best, while also being realistic.
Re your questions, the trigger injection timing varies depending on your response but is usually sometime between day 9 and 13 I believe (with first day of AF being number 1). So mine was on the early side at day 9. And nope, no pain at all for the egg collection. I'm sure it would have hurt a fair bit if I was awake, but I was not aware at all, and all I had when I came round was a bit of mild cramping for half hour or so - no worse than AF. So I would say these past couple of days have actually been the worst part of the whole thing - although bloat doesn't sound too bad, it's pretty unpleasant! And a bit ironic to look so pregnant at this stage haha...
Hope you're doing ok
xx