Clomid's main job is to make the ovaries work harder.
Would ensure that you are monitored whilst on it (preferably with both blood tests and ultrasounds to see if an egg is actually leaving an ovary) as no monitoring is a complete no-no. Its quite powerful stuff and it can affect hormone levels markedly.
My cycles varied from month to month on clomid, normal cycle length was 32 days and mine were anywhere between 29 and 36 days. They tended to be longer on the months blood tests showed I had ovulated. I was never offered scans but had day 21 bloods every month.