heartbeat, Rh factor

I heard Gilhooly's heart beating at 140 bpm today. The nurse says that my blood pressure, weight gain, and girth are all on track. Also told me that my blood type is A- and that if the baby has a positive blood type there could be issues later in the pregnancy - "the Rh factor." It means that at week 28 I'll be given a shot of Rh immunoglobulin (RhIg) to make sure my body doesn't have an "allergic reaction" to the baby. Then, after the baby's born they'll determine his or her blood type and if it is positive then I'll have another shot. Hopefully this will all be fairly routine. Let's hope that either the baby also has a negative blood type or that our blood doesn't mix until after I get the shot.