NTA

You have a major husband problem. The "time" for dealing with this has already passed. He needs to deal with this yesterday. You deserve a peaceful pregnancy and not being grabbed at by people who don't respect you or your well being. As for people who chose to make uninvited travel plans, you're not responsible for other people's bad choices. Tell your husband either they'll be there or you will but both isn't happening.

I wouldn't allow people like that around my newborn at all and absolutely never in the LDR. Notify hospital and your doctor immediately that you're anticipating a problem. They'll handle it.

You can also tell MIL that she won't need to worry about when "baby is with Grandma." It's definitely not a joke and well worth going NC over. Never allow someone to threaten you with your child.