The Dr will let you know if you need it and what your blood type is if you get it.
Im blood type O- but only got one shot around 28 weeks and will get another after the baby is born.
It does help! But i'm not sure my or my bfs blood type. I'm sure I can get that info!!
My blood type is o rh(d) negative, meaning I need the shot too.. It just gives you antibodies to protect the baby so it is very necessary because our own antibodies will attack the baby.. You get 2 before labour one at 28 week's and then another 6 week's later as the shot only lasts for 6 weeks.. And then one after labour in case any of thr babies blood was left behind in your system.. You'll also need one after miscarriages and terminations.. Hope this helps you :-)
You only get it if you have a Rh negative blood type (eg AB negative) you get one at around 28 weeks and the other after labour. I don't have a negative blood type but that's what I've heard lol hope that answers your question