MysticalChick is right. You are definetly ok, for SURE. It's the Rh +/- that makes the difference. My mom is O- and dad is AB+. ANYONE can take O- blood, but - can't take + blood. This makes O- blood like gold, and O+ is pretty important too. You should dontate blood more often! But even in the situation of one partner with + and the other with -, it won't PREVENT pregnancy, it would only make keeping the pregnancy difficult, if not impossible.