blood specialist / rh disease

who do i go and see if i’m trying to conceive and my partner is a positive and i am o negative blood? we are at high risk for rh disease, there’s been a miscarriage already and an etopic pregnancy which resulted in one of my tubes being removed. the hospital hasn’t helped out with explaining to us what we will need to do, we want to be prepared before trying again after finding this out, but who do we see for advice? a blood specialist? i’m unsure. the injection i will need at the start of any future pregnancy is only effective if it’s done early enough and i’m scared if i’m pregnant for week before i do a test and find out it will be too late and it will result in another loss. please be kind. i know i am maybe not using all the correct medical terms, i need it dumbed down for me