Hi erybery, I have not yet conceived on clomid, but this is only my third cycle. from what I've read from other ladies they have usually conceived naturally and then later on had to use clomid. I would say that if it worked the first time then your body responds well to clomid.
Maybe you should pop in to the clomid/metformin thread in LTTTC and have a look around and maybe ask a few more questions. Sorry i couldn't be of more help.