By the day of the transfer, I more or less felt fine, though the progesterone was making me SLEEPY.
I did retrieval on Tuesday, 3 day transfer on Friday, and honestly, I couldn't drive or do anything at all on Tuesday, Weds, but by THurs PM I was feeling fine. My RE believes that nothing will shake a good embryo loose, but I was kind of zonked post-IVF and I didn't have a lot going on, so I stayed in bed the rest of the day of the transfer, and most of the weekend, just because I could.
Physically, the transfer is not a big deal. The retrieval and the stims were for me. And if you think about it logically, there's really nothing you can do to help the embryo implant by changing your activity levels.
good luck with your IVF!! I've been very happy with mine so far, 7 weeks today!