There are science kits like this http://www.thinkgeek.com/interests/giftsunder10/8f3d/
But I don't think it helps you because:
* The baby's blood type is determined by a random combination of both
parents' genetic material. A father with a or b blood type can produce a/b
or o baby with you. You don't know the combination before conception.
* The chance of hemolytic disease is much much less than the overall
miscarriage rate (~20%). And it is usually very treatable after birth.
* Whatever statistical difference your husband's blood type makes, you
cannot do anything about it now (unless you plan to use someone else's sperm
).
