I Have Been Diagnosed With Factor II Clotting Disorder And

I have been diagnosed with Factor II clotting disorder and have noticed over life that I tend to bleed rather freely. However I have fathered 4 daughters, 3 with Factor II, and they clot so severely during pregnancy that they have to give themselves Heparin (sp?) throughout the pregnancy. If Factor II is a lack of clotting, why are my daughters having so much trouble with clots?