While I was at an appointment with my doctor today, we were discussing blood type. She told me what mine was, and I'm a little thrown off. At the beginning of my pregnancy, my mother had told me I was a different blood type. She is O+ and so is my dad, however, I am A+. This is not possible. My parents both know their blood type for sure, so honestly the only thing I can think is that my dad isn't actually my dad. My mom has stopped responding since I told her it was physically impossible. I am so confused and I don't know what to do with this information.