I don't know how I feel...

I have 3 beautiful children and 1 child in heaven, everyone says when your done having kids you "just know" I don't get that feeling although thought I would after the birth of my last child! I'm 33 and feel almost on a rush to decide whether to have 1 more or push the feelings aside!? I don't want to make the wrong choice and regret it but if I'm going to do it I want it to be soon so there won't be a big age gap and I won't be too old either! I'm very 50/50 so how does anyone make such a life changing desicions with those odds? if anyone has felt this way I'd love to hear your story 🙂