I have PCOS and clomid regulated my cycle.
First i was on Metformin to shorten my cycle and get it regulated to 32-35days... before any meds i would skip months sometimes 3-6 months no AF.
Then when I started clomid, My cycles were 30 days like clock work. I am now on my 5th months of clomid and things have changed. I am now on cd33 and still no AF. On cd 31 i tested with a bfn. I don't know if it has anything to do with the clomid, or I am just preg, but it's too soon to tell???
But to answer your question in short, It shortened my cycles, regulated them with a 14 day lutal phase and an ovulation day of cd17. This was with the pst 4 months on clomid.