Have a baby, or not?

I keep battling myself on whether or not I want to have a child. I know my husband does, he wants a boy, and I always thought I wanted a boy too, and seeing as I'm a full time mommy to our 2 year old (his little one from a previous relationship that he got full custody of, eff yea!) I could totally have enough time for a second, BUT I don't fully know if I even want to have any of my own. I'm 18, about to be 19, my husband is 26 about to be 27, we have known one another for about 6 years, dated during his divorce and custody (and prior to his previous relationship for a while as well), I don't plan on having one right now, especially since I have the Copper IUD and no means to take it out until I need a new one, or I decide if I want my own offspring or not. I'm not trying to force him into staying with me, I mean, we're married and I'm raising our current child so I don't necessarily need to make him stay, so that's not the case here at all.. but if I decide I want a child, I would want to have one closer to my current age because then I can still (hopefully) have somewhat more of a life after the children. I also want to feel that bond that a mom has with a child, i know I have the current one, but I never carried her in my tummy or breast fed or and of that good stuff.. I just cannot decide for the life of me, if I want to get pregnant and have another child, or not.

Sorry for the long post.