Catalina - I totally agree with you. I had a nice easy pregnancy and birth with my son, who is now 16 months, and for some time my body has been saying 'why not have another one!?' But in my mind I know this would be foolish. I am not really ready emotionally or financially, and we are buying a 2 bedroomed house so there would be no room for a second baby.
Ironically, before my son was born, I only wanted 1 child whereas my partner wanted 2. Now I would love to have 2 children and he is quite content with 1. I can see many advantages with sticking at 1 and thinking rationally I would like to wait until my son is about 4 yrs old before having another baby - life would be much more manageable!
It just seems that my body has been altered by the pregnancy hormones that it had flowing through it and now it's going through a mad phase of desparately wanting to reproduce!!