I can assure you, you guys can marry, no problem.
Blood type?
Yes, an A positive man can marry an A negative woman. Blood type compatibility does not affect the ability to marry or have a successful relationship. It is only a concern during pregnancy if the mother is Rh negative and the father is Rh positive.
NO,
you can marry anyone you want
you can marry anyone you want
Yes.
yes
see a doctor for such questions
yes
yes
Can o negative blood boy pregnant o positive girl
don't see why not.