Rhesus positive or negative?

Natalie
Hiya ladies so I'm not normally one to post ,but yesterday I received a letter saying I'm Rhesus negative and that I now have to undergo infections as I can be a possible risk to my baby if he or she has positive blood ! 
Are any of you going or have gone though this and can give me and words of wisdom !
Thank you !
Hope all you beautiful mummies are doing amazingly !
Natalie xx