Sorry to hear about your loss. Did you get any answers as to why??
We also use IVF to conceive.
We fell pregnant 10weeks after our son was stillborn. It's hard to explain how we knew we were ready....
Emotionally we got to a point where we realised that we were as ready as we would ever be. The initial grief stage was over for us, and we felt that our life was as close to 'normal' again as it was ever going to get.
I guess for us it was making sure we were through the initial grief and we were confident that we were starting again for the right reason - not just to help with the grief, or to replace our Son, etc
Does that makes sense?
And to be honest, we weren't 100% ready (I don't think you'll ever be),but we were as close to ready as we could be.
I'm now 11 weeks, and to be blunt, it's really tough emotionally and mentally. Something you need to be ready for.