I didn't (and still don't) have any desire or urge for children, however thought if I got pregnant 'I'd change' and 'As soon as I had my own child, I'd feel differently' - as it turns out, that was total and utter bullshit.
As soon as I got pregnant, I became exceptionally depressed to the point of suicidal and couldn't see a single positive thing about the experience - I terminated at 12 weeks and will never, ever try again.
I am now 39, married and child-free. My Husband (partner at the time) fully supported me through that awful period and even if I were to magically change my mind and say 'Let's try again', wouldn't agree as he saw how utterly wretched I felt.
Interestingly - there was absolutely NO pressure from family, or from friends... people who know me, know I enjoy deviating from the herd or being 'normal', so noone ever asked 'So when are you having children?' - not even my parents. The pressure was all in my head and from what I perceived - I genuinely thought that even if I didn't feel like I wanted a child, these magical hormones would happen that would make me happy about being pregnant and being a Mother....... Ha.
I absolutely love my life, it's so varied, so interesting and I've got 3 Nephews and Nieces who are awesome.
I don't regret being child-free at all - I regret ever trying to get pregnant in the first place (It literally took one time and then it happened) and believing some of the crap people spout but I don't regret terminating.
I now believe that if there isn't this massive overwhelming desire / urge, you really shouldn't have a child.