High Antibody Titer

Josey
Does any body know what having a High Antibody Titer while pregnant means? One of the first times of going to my Obygn, they did blood work and told me I have a high antibody level. I'm currently in my third trimester and after having blood work done again, they say it's still there? My doctor acts like I shouldn't be alarmed, but I still want to know what this means in Laymans terms. Please help