Pregnancies back to back?

Have any mamas here gotten pregnant around 6 months postpartum. 3 months postpartum with #2 and my hubby and I have talked with my ob about ttc our third (and final) baby in a few months. My ob said that since I'm young, and have healthy pregnancies she would be okay with it as long as my blood levels were all healthy. Are there health concerns related? For me or possible baby? Its something I'll be talking to me doctor about in detail before ttc again, but I'm just wondering what others' experiences were?