I can't get babies off my brain!!!???... pls read...?

I am a very happy 26 soon to be 27yr old mummy of 4, I have an 8yr old son Morgan, a 4yr old daughter Macey, a 3yr old son Regan & an 8month old dughter Ruby. I loved finding out I was pregnant with all of them, I loved being pregnant, I loved my hospital appointments, I loved the buzz waiting for them to arrive, I love every minute being a mum. I thought Ruby would be my last baby, a nice even number, 2 of each in perfect order.... But my brain is telling me otherwise & its really frustrating! I no that I shouldn't have anymore babies for reason's such as house & car space (although I do have a 7 seater!) & obviously because of money. Not only that but. I want to really enjoy my 4 babies. So why do I keep feeling so broody?? I do want another, but I am fighting it. I wish numbers weren't such an issue, I'd have 10 babies!! 5 just seems like so many :( anyone else had a big family or anyone else feel the same?? Pls help!! Thanks x