I'm at the point where the OB has to stick a needle on my butt cheek to prevent my body acting as if…

I'm at the point where the OB has to stick a needle on my butt cheek to prevent my body acting as if my baby is a virus. Apparently my blood is negative while baby is positive and that isn't ok so we are taking good precautions up to when the baby arrives. Now I've had this needle before when I was in the ER for blackouts during my pregnancy. That son of a bitch is thick and long and it hurts so much. I'm not ready to have my ass poked with a needle again. I already know my SO is gonna laugh at me when it happens but he is going to find out that once that needle business is done, I'm going to expect a lot of favors. Demanding ice cream and pizza. And even after I don't feel pain any more, I'll play him like a fiddle. It's about time i get my turn to be taken care of with gentle care. Muahahaha