What r anti-k cells in blood and can anyone without a prior blood transfusion have them or pass them on??

I have A positive, K negative blood, apparently only 5 % of the population have K neg, thanks to a transfusion ten years ago and as such I now have to carry a card around with me in case I ever need blood again in the future as it would be dangerous for me to receive anything else, but everyone has some of the K cells regardless of your blood group, as to passing it on,not from person to person but my partner and I were trying for a baby at the time and he had to have a blood test to make sure the same type wasn't present in his blood, as it would've meant keeping an eye on the pregnancy and the baby, but that was only the case because of my blood type and wouldn't normally pose a problem.

Hope that make some sense x

i know that vitamin k is produced in your Colon, it is an anti-hemorrhage agent, it helps our blood to clot. i don't know if this would be something in the body that would destroy the bodies natural k therefore making you hemorrhage. it sounds like that . sorry that's all i know