I hope everything will be fine thanks!
Mine was positive n I had a shot at 29 weeks n have to have another one after I give birth. Its just so your immune system doesn't attack babies if his blood type is positive n yours is negative. But baby will be fine. The first shot needs to be given between 28-32 weeks. That's what my doc said anyway.
Yes, you will have to go in regularly for an RH shot.
I think they would have to give you an RH incompatibility shot
http://www.babycenter.com/0_blood-test-for-rh-status-and-antibody-screen_1480.bc
Maybe that'll help you out... Good luck!