Will I ever want children?

I'm 31 and I am currently indifferent about having kids... I could really go either way with it. I'm not currently trying for kids, but if I did get pregnant, I wouldn't be upset. I might even be happy about it.
I guess I just think it's weird I feel this way. At this point, I'm one of the only women in my groups of friends that doesn't have kids. And even though they all know that I feel fine with the idea of not doing so, they all tell me I would be a great mom.
Will I ever get that urge to make babies??