As far as I know, it's always been like this? I've had the shots at 28 & 32 weeks with all of my girls.
I'm A-, DH is A+. All our girls are A+, so I had to have the shot after birth as well.

ETA:
some info on Anti D from the Australian Red Cross website

http://www.donateblood.com.au/files/..._of_babies.pdf