So sorry about your daughter's birth! I am rh- and have done a lot of research on the topic, but have not been sensitized, so I have no personal experience. However, please dont ASSUME that you are sensitized. It's true that your birth experience might make it more likely that you were sensitized, but even in the absence of rhogham the sensitization rate is still pretty low. I'd take a deep breath and ask your OB to test your antibody level's now. There is a chance you are NOT sensitized and have nothing to worry about. Well, in that area, anyway...
If you are sensitized you'll want to know as early as possible because they can monitor your baby during the pregnancy. You'll probably be followed by some specialists, particularly as you get nearer to term. They might decide it's safer to delivery early and balance the problems of prematurity with the problems of having baby stay in your body where your antibodies are attacking her blood. They might need to give baby a blood transfusion, and I have even heard of doing that prenatally, but I don't know if it's common.
With advanced medicine these babies have a much better chance, but again, prevention is a lot easier and I don't think you see many babies suffering from rh disease these days; it is pretty rare.
I had a mc earlier this year and knowingly declined the rhogam. I am pg now, and the first OB I saw flipped out and told me that was stupid, made a big deal of checking my antibody levels right away. They were neg (not sensitized) , but I had not been worried. I had done my research and was comfortable with my decision. The next time I saw a different OB and he seemed rather blasé about the whole thing and said for miscarriages earlier than 12 weeks he doesn't even recommend it. Guess it all depends...
Anyway, I hope you can get an appt and get some bloodwork done. Either way, you can put that worry behind you or start planning what you'll need to do to carry this next little one as safely as possible.
Please update and let us know what you find out. You'll be in my thoughts.