I am also moving on from IUI to IVF next cycle (am day 2 now of IUI cycle) and told my Dr last month that I wanted to move on. She was fine with it and seemed to say that I could start IVF anytime I wanted as long as I thought I was ready.
I am having a lap done next week and also seeing the IVF counsellors but I think you should be fine to move straight into IVF.
Good luck.