I'm ok with being a single mum if it comes to it, iv done it twice before.
You still are doing it with your two. They are still small children with needs.
I'm going to be candid because in my job I see a lot of mums with EUPD, head injuries and/or trauma. What I see is a lot of wanting babies because they are perfect and new and novel and will 'fix' everything. Then they become complex young people with needs and wats and they aren't perfect any more so they need to be replaced with babies. I also see women having babies in terrible relationships because the mums are trying to 'fix' their lives. And think that creating a family will make the past different. And, tragically, I see the teenage products of this life. Almost always with trauma and MH issues, anxiety and depression. It's nature and nurture. They have genetic predisposition, plus they've been parented in a less safe and more chaotic way. They've had absent or bad fathers, and single mums who aren't able to parent in a safe and stable way. They struggle and suffer.
You're broody. When you have two children already, you need to understand that their needs come before your wants. If you can't do that, you can't parent and therefore shouldn't have another.
What I suggest is reading parenting books, taking parenting classes, throw everything into parenting the girls you have really well. Take that broodiness and put it into the children you have. Make time and space to nurture and love them. Find ways to connect. Learn all about their hobbies and likes. Be the best mother you can be to the existing children.
You can change the script in your family and make a different life than you had. But you can't do that by having more babies with a different man, in a chaotic relationship.