What is it?
On average a woman's menstrual cycle lasts 28 days, but cycles can vary from 24-35 days. Menstrual bleeding usually lasts anything between 2-7 days. However some women find that often their period comes early or late, or can be exceptionally light or heavy which is termed “irregular”.
Many factors can contribute to this including low weight or polycystic ovaries. It is advisable to see a doctor if you are concerned, for example if you have bleeding in between periods or after sex, if your period is exceptionally heavy, if your period lasts longer than 7 days or are more frequent than once a month.
This is individual to the cause for the irregular period.