Your current situation may or may not be related to the incompatibility of the blood groups. If this is the first pregnancy
, and if the viability of the pregnancy had been established previously through visualization of the heart beat in a sonogram, the symptoms are in favor of a threatened abortion
and if the fetal heart becomes invisible, it is indeed an inevitable abortion; blood groups do not play a part here. Blood pregnancy test taken on alternate days should show a doubling titre if the pregnancy is good; else, the levels show a decline. If both of you belong to the same blood group including Rh type, you are compatible. If your wife has the Rh negative
type while you are positive, you have incompatibility, in which condition, progressive pregnancies may have unfavorable outcome, the first being normal. Hope this helps.