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PLEASE do not worry. Your midwife is COMPLETELY wrong, and really should not comment about something she patently does NOT understand, and about which she has a pitiful amount of knowledge. She should never have answered your questions with her lack of knowledge, but should have left it to your Obstetrician. I note that you are a fellow "Brit"! Within the British population, the percentage of people who have the R1R1 type (which is a type within the Rh Blood Group System) is 16%. Also within the British population, the K- type (which is part of the Kell Blood Group System) is 91%. What that means is that 91% of 16% of the British population is R1R1, K-, or, give or take, a few decimal points, 15% of the British population (about an eighth of the British population). On Friday, 19th October 2018, the British population was measured as 66,690,116! Let's call that 16.5 million in round numbers. This means that, give or take, 9, 975, 000 in Britain are R1R1, K-. Now, admittedly, your midwife will only be looking after women, but, even then, that means 4, 987, 500 women will have the same Rh type and K type as you! How your midwife has only come across your "rare" type four other times in her career, is beyond belief (and I genuinely mean BEYOND belief), unless, as I say, her knowledge of blood groups and blood group serology is incredibly poor, and I repeat, she should NEVER have worried you like this. Just in case you think that I do not know what I am talking about, I have worked in the field of blood transfusion/blood group serology for 43 years, have been an internationally invited lecturer and am the Chief Examiner in Transfusion Science for the Institute of Biomedical Science in the UK, and am a co-author of the British Society of Haematology's Guidelines for Blood Grouping and Antibody Testing in Pregnancy. I don't write that to "blow my own trumpet", as it were, but to try to reassure you that I actually do know what I am talking about. I should warn you that "consulting Dr Google" is equally as useless as listening to your midwife. You should really relax. YES, it is possible for you to produce red cell antibodies during your first pregnancy, but it is INCREDIBLY RARE. It is even more rare for such an antibody to cause any problems in a first pregnancy. I notice that the report from the Blood Bank was that they detected WEAK reactions with 26 of 30 panel cells, but they could not identify a specificity. They have requested three further samples of blood to send to the Reference Laboratory. Again, to give you some comfort, I hope, I ran a Reference Laboratory in London for 16 years before I retired in 2016, and we saw, quite literally hundreds of cases like yours. For a red cell antibody to cause any problems within you pregnancy, it would have to have a titre of 32 or above (this means that it would still be detectable when it has been diluted THIRTY TWO times). I can assure you that the mere fact that the Blood Bank reports weak reactions means that there is ZERO chance that the titre will be 32 or above. If a Hospital Blood Bank, however big or famous the hospital may be, cannot identify an antibody, it is almost universal practice that samples will be sent to a Reference Laboratory for further testing - AGAIN, DO NOT WORRY ABOUT THIS. There are many, many red cell antibodies that are clinically insignificant, both in terms of transfusion reactions and haemolytic disease of the foetus and newborn (which is what your midwife has left you worried about). I KNOW it is difficult, but PLEASE do not worry. PLEASE take no notice whatsoever of your midwife on this matter (I am sure she is an excellent midwife, but she is patently no expert in the field of blood groups), but DO talk to your Obstetrician, who, I hope, will have talked to your hospital's Haematology Consultant, who, in turn, will have spoken to the Consultant in Charge of the Reference Laboratory, and I am sure that they will echo my opinion that there is NOTHING to worry about. Oh, and lastly, I am R1R1, K- myself!!!!!!!!!!!!!