RHnegative Blood Pregnant

I have had bleeding gums since being pregnant which I know is a symptom.

I also have RH negative blood and need to get the Rogram shot in a couple of weeks. I’m 24 weeks pregnant.

If I swallow the blood by accident will that mix with my baby’s blood? I know if my baby’s blood is positive, there are a lot of bad things that can happen.

Just curious if that is something to be worried about