A month ago i had my period twice in one month, which is not uncommon as i can ovulate twice in a month. but this month i have not got my period. i spotted for 2 days very lightly then nothing for 2 days then spotted lightly again for 2 days neither time

Spotting: suggest pregnancy test. If negative your cycle may straighten out next month.

Irregular periods: Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Infections, polyps, fibroids and hormonal changes can cause. Remember cycles come every 21-35 days -- not necessarily monthly. Ovulation occurs once per cycle.