Reply To: There are 8 different blood types in the world. Which one are you? Activity › Forums › General Discussion › There are 8 different blood types in the world. Which one are you? › Reply To: There are 8 different blood types in the world. Which one are you? July 28, 2014 at 5:04 am #6651 Kimberly BrownParticipant My kids are O positive like me. My mom is also O positive. I actually like talking about blood groups in my house. I always learn something new from my husband.