It actually is just the opposite. An Rh negative women and a Rh positive man would be a concern for a pregnant women. If you are planning on having a baby and the women is Rh negative and man is Rh positive the women should receive a shot of immuglobulin so she doesn't build up antibodies that could destroy her fetus. Please consult your doctor.
I can assure you, you guys can marry, no problem.
no problem
If a father is O positive and a girl is A negative, this will not likely pose a problem with a baby. It may cause the mother to have to get a Rhogam shot when she is pregnant.
When they become pregnant there should not be any problems related to the rhesus blood groups - this would only be a potential problem if the mother was negative, and the father was positive.
yes
yes
Blood type?
yes
yes
you can marry anyone you want
you can marry anyone you want
An Rh negative man can marry an Rh positive woman. There is no reason this cannot happen.