how many days between period
A womanâs monthly cycle is measured from the first day of her menstrual period until the first day of her next period. On average, a womanâs cycle normally is between 28-32 days, but some women may have much shorter or much longer cycles. Ovulation can be calculated by starting with the first day of the last menstrual period (LMP) or by calculating 12-16 days from the next expected period. Most women ovulate anywhere between Day 11 â Day 21 of their cycle, counting from the first day of the LMP.