Pup help

I have a very cuddly mommas girl, my little Luna 💛. I’m trying to teach her she can’t cuddle with me on the bed anymore because her sister is coming! This is the one chair she’s allowed up on but she only comes up with permission... but I’m thinking I probably need to stop having her come up here too. This is my baby though so she will never be neglected... but is there any advice on how to help get her adjusted? Sometimes I feel like she knows I’m pregnant and sometimes I think she’s completely oblivious lol. Her sister is due 3/12/2020. Any advice on how to get a pup adjusted to a new baby?