The safe period refers to a female menstrual cycle, which is related to menstruation. The female menstrual cycle lasts from 26 to 35 days
These are all normal situations, and there is a gap of about 10 days. It can be seen that the safety period may not be as safe as expected. And in Hong Kong
, the safe period is generally regarded as the 7 days before and 7 days after the onset of menstruation, so it is commonly known as the first seven days and the last seven days.
Principles of safe period contraception
Taking the 28-day menstrual cycle as an example, 3 to 5 days after the first menstruation is called the "menstrual period".
Start the first phase of safety period. The two safe periods between menstrual cycles are separated by the ovulation period. Ovulation period
It is almost certain that it will arrive on the 14th day before the next menstrual period, or 5 days earlier or 4 days later. This is also
The so-called dangerous period. Because male sperm can survive in the female body for 3 days, it is necessary to limit the risk period to
The 5 days before the aforementioned 14 days are further advanced by 3 days to prepare for unexpected events. This day is the end day of the first phase of the safety period. No.
The second-stage safety period starts from the day 4 days after the aforementioned 14 days until the day of the second menstruation. It can be seen that the
The safety period of the second stage is safer than the first stage. Ovulation usually occurs 12 to 22 days after menstruation and is in crisis.
insurance period.
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