I am O-, Dh A+. First DD was very slightly jaundiced and I was given the jag. Then I miscarried at home, no blood tests and no antibodies jag given.
When DD2 was born she was bright yellow, severely jaundiced and rushed straight to intensive care, put in an artificial sunlight machine. blood tests taken from her heel, also me and OH who was A+. She pulled through and we went home with strict orders to place her in sunlight whenever there was some.
6 weeks later my very excited GP, who had previously been a paediatrician, turned up at our home and explained that he had been asked by the hospital to collect more blood samples for research. Apparently, a very rare variant factor of group A blood had recently been discovered by researchers and locally the only known carrier was my DH. He explained in detail that ABO and RH were the main factors but not the only ones causing incompatibilities, between blood groups. In our case I had developed antibodies against this factor during previous pregnancies and that is what had caused DD2's severe jaundice.
I was advised that neither I nor my DH and DDs should every be a blood donor but I would be safe to have another baby as they would simply change the baby's blood in utero and all would be fine!!! I immediately decided that my family was complete.