O-Neg blood type

Okay so I have heard some confusing things about my blood type. I heard from one person that if I have O-Neg blood and my husband has a positive blood type (he has B-Pos) that if and when I become pregnant that it could be lethal to the child and there is a higher chance of a miscarriage. I am extremely worried about this. What can I do to prevent this? Thanks ❤️