I am a mother of one 2.5 year old and it is looking like that will be it for me. My husband isn't interested in another unless I was adamant and I've just had a career boost in my work that I don't want to take another long break from.
I'm almost 37 so time is ticking. I've never been particularly maternal, though I've taken to my son far more than I thought I would have - he is my world at the moment. Sometimes I do think it would be lovely for him to have a sibling and I'm a bit sad to come to terms with him as my only one. Other times I think there are too many humans on the planet already and do I really want to do this all again (we have little support and we both love our independence) and create another backwards step in my career (which it did the first time - no regrets, but facts).