hospital delivery room

Okay so I need some opinions on this situation. My sons dad has a new girlfriend and all he've been doing is stressing me out really badly and having his girlfriend write me and say things to me and at this point I just feel like there's too much baggage & he should be putting his girlfriend in check and not telling her to do this! I really do not want him in the delivery room when my son arrives I feel like he will do nothing but ruin it I should have a good experience this is both of our first baby but I just feel like he needs to seriously grow up and I don't want him ruining anything for me while I'm in labor I don't need the extra stress. Any suggestions??? Please help me smh