Separation anxiety

Im 12 weeks pregnant and my son is 2 years old and we are soooooo close. He hasn't been away from me at allllllll for more than 30 minutes at a time. He is still room sharing with us and he still breastfeeds a few times a day. I am literally so scared to have to leave him to give birth. I know he will be sad if I'm not home for 2 days and I honestly think I will panic even more than he will. I don't know how I'm going to enjoy the birth of my new baby while I'm just freaking out about getting home to see my son. Am I awful for feeling this way? What do I do to prepare both of us?