It wouldn’t matter if your baby is rhesus negative or positive if you’re positive yourself, so don’t worry.
The problems come if it’s the other way round. It helps to understand that Rhesus D is an extra antigen. If you have it, you’re positive. If you don’t, you’re negative. Think of it like an added ingredient - rhesus negative is a black coffee, but rhesus positive is the same coffee mix but with milk added.
If a woman is rhesus negative, this means she doesn’t have the Rhesus D antigen so her body hasn’t learnt to recognise it.
This means that if she has a rhesus positive baby, and her body detects that baby’s Rhesus D antigen (if you’re positive, you have this antigen) she will produce antibodies to fight it, and these antibodies can cause problems.
A rhesus negative baby would not be producing the antigen for your body to detect and mount an immune response to.
A rhesus positive baby would have the antigen, but your body already knows about it because your own body has the antigen too and has already learnt it’s not a problem. So again, you wouldn’t be producing those potentially harmful antibodies.
Does this make sense? I know it’s tricky! Congratulations on your pregnancy.