Donna has a regular menstrual cycle.if she has a first menstruation on January21, 2021bwhat will be the date when she will have her next menstruation for the month of February.
The length of the menstrual cycle varies from woman to woman, but the average is to have periods every 28 days. Regular cycles that are longer or shorter than this, from 21 to 40 days, are normal.
