Ok, just googled Fertomid and it's clomid.
Right, well I had 3 cycles of clomid. It didn't work for me. It has worked for others on the board though. I suffered with migraines, hotflushes and mood swings on it, so my consultant changed drugs and put me on Tamoxifen. I did conceive on that but sadly it was a biochemical pregnancy. At that time, we didn't know that I had other issues which impede implantation etc.
Good luck, I hope it does the trick for you.
PS I know people who have conceived on clomid, but I don't know any who conceived twins on it. HTH.