My clinic always aims for 5dt, but if there are not many fertilized eggs, they feel that they have a much better chance in than out, so prefer to t/f asap. Waiting til day 5 is all about picking the best of a large selection. if there aren't many to start with, there's no benefit in growing them on that long. I had only 3 eggs collected, and while all 3 fertilized, one didn't really develop well, and they were very keen to do a transfer on day 3 as a result. I had 2 embryos transferred, and had 2 heartbeats at 7 weeks, but only one by 9 weeks. All's still well with that one now, at 24 weeks.
My understanding is that they have a better chance inside you than in a laboratory. So if you've only got 1 egg, then definitely a 2 day transfer is your best bet!
Like Pholi said, growing them to 3 or 5 days is a strategy to use when you've got multiple eggs and you want to see whih will be viable.
My clinic do the same as Pholi's. They aim for a 5dt but only if you have plenty of embryos. I only had two so we did a 2dt which is now my 17 month old daughter. Good luck!!!
Thx girls, so good to hear some success stories. Went ahead this morning, they said the embie had significant vacuoles, so I'm not sure how hopeful they are. Now the wait!
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