Family conflicts: Advice?

My step mom and biological mom have never gotten along. For quick backstory when I was 16 I decided I no longer wanted to go back and forth between houses and moved in with my dad and step mom full time. My mom didn’t take this well, at all. When I was trying to love my stuff, she was taking it out of the car and moving it back into the house, blocking the door so I couldn’t leave once in the house and even went as far as to stand behind my car in the driveway so I couldn’t leave. She even called the police on me and reported me as a runaway, and threatened to take my dad to court and called everyone, including me, a bunch of names. Skipping forward my mom and I have an okay relationship now, however she still tends to bring up the past a lot. I’m 23 now and my husband and I are expecting, I’m 14 weeks today. My step-mom knows the gender and was going to plan our reveal for me with my sister so I didn’t have to stress about it. Well my biological mom got very upset about this and demanded to be a part of it. My step mom let her because she said she should be involved if she wanted to. But it ended in conflicts and he said she said and now I’m getting different stories from different sides and it’s stressing me out to the point of tears. I just don’t know what I should do. My husband tried talking to my biological mom, she denied everything, tried to guilt trip him and when that didn’t work she promptly decided she was done with the conversation and hung up. I just want to be happy and celebrate our baby but I just feel like crap. Anybody else have complicated families and have any advice?