I was thinking today.. what happens if I dont get pregnant on clomid?

How long can you use the clomid for? I am ovulating on it but is there injections that can be used after? or do you go straight to IUI?

This is my 3rd cycle on clomid. First cycle was 50mg and I didnt ovulate. But I have been on 100mg for this the 2nd month and it doesnt look like it has been successful.

Sorry for all the questions, I just want to make sure I am prepared for what might come my way :/