Rh shot!

Cristal • 🏰Htx
I'm 30 weeks and rh o negative. I've been telling my doctor so she remembers to give it to me at 28 weeks, she missed my apt and I didn't receive it, now I'm seeing a high risk doctor who's watching the antibodies in my blood. Here's my question, What happens if I didn't get the shot? I've never missed it with my other two pregnancies and now I'm worried.