Originally Posted by
glory
Nope not necessary, but they give it to you just in case (read that as, we don't know who the dad is, so we will do it just in case!) I am O- and so is my dh and I had to get the shot last pregnancy cause of late bleeding, even though I told him dh was O- also.
I don't know if this has been disproven, but I read somewhere that there is a rare thing that some women can have and they can't carry boys, but there is no equivalent for girls... like I said, it was a while ago and with technology things always change.