Silently freaking out

Mommy💏again • Hey there just a loving wife and mommy in her early 30`s trying to expand our family to the max! I have challenges with PCOS but I will overcome them as many times I have to in order to get life here!
So ladies I am freshly pregnant with baby number 2 and I am O- how soon is the rhogam shot administered? I keep reading 28 I did get it at 16wks 28wks and after birth but is it not given any earlier??? 16 and 28 weeks are a loooong way to go