RH- and third pregnancy, anything different?

It would be treated like your last pregnancy was. You will receive the Rhogam shot past 20 weeks when the baby is born they will test the baby if you have a child with a positive blood type you will receive another shot to make sure you don't become sensitized. There are no precautions you can take it will run much like your last pregnancy. I had my husband tested to see what his blood type would be before we started having children and he is a positive blood type luckily all the children ended up with the negative blood type I am pregnant with my fourth and if this baby turns up to be a positive blood type this will probably be my last pregnancy. I have suffered miscarriages along the way I have come to believe that I think my body automatically rejects the positive blood types because I know I was told that RhoGam can cause that problem.

If you're Rh-, then you'll be treated and screen as you were during your previous pregnancies.

They'll give you a dose of RhoGam around 28 weeks gestation, then after delivery of the baby they'll run tests on the baby to determine it's Rh status, and if it comes back positive then you'll get a second RhoGam injection within 72 hours of delivery.