Sleep help

For context, I’m 39 weeks pregnant with a 3.5 year old. My daughter has always slept badly, needs a lot of support to fall asleep, wakes in the night and needs me to go and comfort her or comes into our bed. I honestly don’t mind it, however I’m worried about how we’re going to manage this with a newborn! If she knows I’m in the house, she won’t let my husband put her to bed or go in during the night. She’ll literally scream and panic that I’m not with her then it ends up taking ages to get her down again. He’s really great with her but just spends less time with her as he works full time (often in the evenings too) and I’m a stay at home mum so she has a strong preference for me. It’s also frustrating/upsetting for him when she has that reaction so we don’t really know how to deal with it. I have no idea how we’re going to cope when the baby arrives, I’ll be breastfeeding and not pumping initially so he can’t help with the night feeds, which means he really needs to take over with our 3 year old but we’re not sure how to approach the transition for her! Any advice please?!