QS Study

Safe Period is the period of the menstrual cycle during which chance of pregnancy is least though frequent coitus due to the absence of ovum. Safe period is from day 1 to 7 and day 21 to the rest of the cycle when you can have sex without worrying about getting pregnant.

Calculation of safe period: When cycle is 28 ± 2 days, the safe period comprises:

(i) 4 days of menstrual flow,

(ii) 3 days of post menstrually,

(iii) 9 days premenstrually.

The average menstrual cycle is 28 days or a little less, but if your cycle is longer than 28 days, the safe period is not reliable. The menstrual cycle is usually divided into three phases: the follicular phase (pre-ovulatory phase), ovulation, and the luteal phase (post-ovulatory phase). The length of each phase varies from woman to woman and cycle to cycle, though the average menstrual cycle is 28 days.


  • It is a simple and traditional method,
  • There is no religious barrier.

Demerits: Always it is not safe except regular cycle.

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