Is type o positive compatible for pregnancy with AB?

No, type O positive blood is not compatible for pregnancy with AB blood. This is because type AB blood has both A and B antigens on the surface of its red blood cells, while type O blood has neither. If a woman with type O blood is pregnant with a fetus who has type AB blood, the woman's immune system may attack the fetus's red blood cells, causing a condition called hemolytic anemia. Hemolytic anemia can lead to serious complications, including miscarriage, stillbirth, and brain damage in the newborn.