I'd hold off worrying until Rochelle is a few months older (unless you are really raring to go)!

I did find it a bit harder preg with a toddler, and balancing two is just that - balancing! Maybe check out the thread that was around somewhere about the spacing of children to check out others experiences.
Some like to wait until no 1 is at school and found it easier, some bang 'em out all at once (me!).
I thought since I was up all night and up to my ears in nappies that another wouldnt make much of a difference. I mean it does, but I'm happy that the nappies will all be out of the way soon, and I just couldn't see myself going back for another now I have a bit of independence back.

Totally up to you and how you think it will affect (and I mean that in a good way) your family.