Hi doctor, When I was 17, I donated blood. They sent me a card with my blood type B positive. When I was pregnant, the first time they tested it twice and told me it was B negative. I thought the donation test had been wrong. After my second child, my doctor upon hearing this story checked my blood again, and it came up B positive. He then told me I had something that allowed me to have both blood types. I cannot remember what he called it. Can you help me?
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