I ovulate on day 17 and 14 days later my period starts. I can almost time it. Your luteral phase can last anywhere between 12-16 days. Anything shorter indicates a problem. Anyway - the breast tenderness starts about day 21 and lasts for about 7 days.
Some months are better than others.
The other side effect I experienced was hyperness and very mild depression. I was up one minute and crashed down the next. I cried at the drop of a hat and couldn't for the life of me control my emotions. The other thing I found bittersweet about clomid is that the higher dosage you take, although you may ovulate, the more dry your mucus gets. I was up to 100 mg and drinking robitussin by the bottle and by month 5 my mucus was non-existant.