I was lucky because in the UK all newly-delivered babies of Rhesus Negative mothers have their blood group tested and, if they are Rhesus positive, mum gets a shot of antibodies ("Anti-D") to mop up any of junior's blood cells in her system before her immune system gets a chance to kick in. However, this is only partially successful as each successive pregnancy still incurs risk (my babies were being born earlier and earlier). Fortunately in my last pregnancy both babies were Rhesus negative, but they were still six weeks early.
I had anibodies/anti-D as well.
One thing that annoyed me about this anti-D, was that my EX is O neg, I' m A neg & they still insisted upon testing me throughout the pregnancy, so I asked if they thought I was sleeping around.... that upset them a bit.