Its a tough one Seachange because you just never really know how you are going to feel. My opinion would be to take the day, not just for the physical reasons but for the psychological mental health reasons.
I've taken today and tomorrow to recover from EPU, just because I don't want to aggravate the bruising and make the feeling worse. I am going to choose to take at least the time following transfer off as well.
I know that last cycle about 5 or 6 days after EPU I blew up like a balloon and had some pain as well so was really uncomfy at work. That I didn't expect quite so much.
If you're not comfy generally, I would think a day of being upright in any way makes things tougher... but it really is your call hun.