BerraBrooder.... the tip is to drink lots of water after EPU. It depends on the individual, but I find a good 2 days, before you're starting to feel a bit more normal again. You'll still keep getting twinges for quite a while.
Samlow... some clinics prefer 3 days, others 5 days. There are equal number of pros and cons to both. My FS actually prefers day 3 transfers, but I absolutely insisted that they grow them out to 5 days. I had previously a 2dt and a 3dt and both were BFNs, but I couldn't tell from that where the problem was. So I said, from now on I would only do day 5 transfers, even if there was only one embie. On my 4th cycle, the embie grew fine to day 3, but that's where it stopped. If I had had a day 3 transfer I would never have known if it was the embie growing or an implantation problem. This time I had 4 embies - on day 3 I had two 8 cell embies - by day 5 one grew perfectly and the other one was lagging behind. If I had transferred one at Day 3, who knows if I would have got the better one? I read somewhere that the stats for a pregnancy with a day 5 transfer is higher than day 3, as you've already weeded out the ones that weren't going to make it.
Some clinics don't like Day 5 transfers as it is more nervous for them - some clinics aren't confident with growing them to day 5, and other clinics like to have better transfer statistics, as some don't make transfer on day 5 (like my fourth cycle). Other clinics say it's better to get the embie back into its natural environment, so prefer day 3, but if you read up about it, on day 3 in a natural pregnancy the embie would still be in the fallopian tubes, where as it doesn't actually get to the uterus until day 4-5, so that's another reason for day 5.
Hope that helps :-))