Hi Caroline,
I've done 7 rounds of Clomid with HCG trigger shot and IUI and after that moved on to injectables. My Dr felt that by the 3rd round I should have been pregnant already. I gave it a couple more months and it didn't seem to work. I have moved on to Injectables with IUI and I must say that the injectables are definitely better than the Clomid...plus extended use of Clomid can thin the uterus lining. I would if you can, look into injectables with IUI before going onto IVF. Also have you had any testing done - ie... HSG, LAP, Immune testing etc..? If not perhaps you can look into that before going forward...
In the end of course the decision is yours to make. You have to be comfortable with the plan. *I gotta tell ya that I hated Clomid though!*
I hope this helped a little...
Good Luck with what you decide...we'll be here for you no matter what!

Kim