Hi Bees, anyone out there have an RH negative blood type and need to have the rhogam shot at 28 weeks?

My doctor didn't seem too concerned about it, but the idea that if my DH has an RH positive type (getting tested this week to be sure), my body would see LO as a foreign body and attack freaks me out!

If you did have this situation, did you also have to have another shot after delivery if LO was RH positive? Did you experience any side effects from the rhogam?