Rh negative

Jackie • Happily married to my soulmate, mother to my amazing son Odin, Excitedly expecting baby #2 in May 2019!!
I found out at my 25 week check up on Monday that I am rh negative. Just trying to get an idea of how many other September momma's have this blood type. I was surprised by the news and didn't have much time to ask questions so I was just left feeling a little miffed and overwhelmed by the news. I thought my pregnancy and baby were perfect until now. I know this doesn't mean anything is wrong with my son but I can't help but be a little worried.