I’m at a loss

I’m at a loss on what to do. My six year is refusing to sleep in her bed. A little back story up until a year ago I was a single mom and allowed her to sleep with me in bed since she was a baby. It always just worked for us. When I met my fiancé we started trying to get her to sleep in her own bed when he moved in with us in November. It was hard, especially when we found out I was pregnant I knew I had to get her in her own bed before baby came. We worked hard and through rewards and other such things she’s been sleeping in her bed for a couple of months now. Just recently (the last week or so) she’s started to refuse to sleep in her bed. We compromised one night and allowed her to sleep on the couch with making emphasis on that it was NOT going to become a regular thing. And then tonight she begged and begged to sleep in bed with me. Finally after an hour and half fight with her my Fiancé broke down and just said he would sleep in the couch and to let her sleep with me with the statement that it was just for tonight and she would have video games and such taken away tomorrow (side note we only allow her an hour of video games a day). I’m just worried that since we are 7 weeks are less away from baby’s arrival that she’s regressing. I know that with toddlers and such when new babies are added it can happen. But can it happen with a six year old and how do I get her back on track of sleeping in her room?