I'm 18 weeks too I've been wondering the same thing. Anyone?
I've been told it is possible for a natural birth after having a c-section, I'm currently looking into it for this pregnancy. My doctor is leaning more towards another c-section only due to the complications that I had with my first pregnancy.
With my first pregnancy I had an emergency csection at 34 weeks. With my other two pregnancies they were natural. I am going natural with this pregnancy as well.