Period comes in 21 day cycle doctor. Nov 1 is starting date means, it comes next on nov 21 instead of nov 28. What is the reason doctor. For one year it is so.

Suggestions offered by doctors on Lybrate are of advisory nature i.e., for educational and informational purposes only. Content posted on, created for, or compiled by Lybrate is not intended or designed to replace your doctor's independent judgment about any symptom, condition, or the appropriateness or risks of a procedure or treatment for a given person.