You know what chrissy, You can't win. If you were to tell people that you were intendin gon more kids you would probably cop a flamming because of your age. "gee you left it a bit late?" "your going to be old when they are teenages" etc.
I would just say, "We'll see what the future brings" and let them make there own assumation out of that. At the end of the day its your life.
ETA- I'm 25 & pg with #3, I get comments all the time like, "gee your a glutten for punishment" or "your weird for wanting more"
Why am I weird? its not like my boys are off the rails. They are very well adjusted little boys. maybe the reason I am happy to have more is because I know DH & I can handle it.