Hi
I just got my 28wk shot yesterday. There was nothing to it, honest!!
Worst part for me was the blood tests for anaemia and gestational diabetes which are done as standard at 28wks. once you have had them, you will think nothing of turning round and bearing a tiny little bit of your butt for the anti-D shot
Had to wait for 20mins after the shot to make sure al was fine, which it was, then i was let home.
Only other thing I will say is that if you have a bump or fall in the 1st tri, they dont give you anti-D - dont know why. this happened to me on Xmas Eve and I went to hosp on Xmas day, but they wouldnt give me it.
I wouldnt worry about it too much - the MWs have it well under control, and the risks to mother and baby are minimal. Of course there will be times you will read too much in to it, but just remember, it is quite common and well controlled nowadays.
Good luck with the rest of your pregnanacy