Will accidental pregnancy occur during the safety period? I think this is a concern for many women who enjoy using safe period contraception. The following detailed answers introduce the methods of safe pregnancy. Let's take a look together.
Is there an accidental pregnancy during the safe period?
1. The principle of safe period contraception is an ideal state
The birth of new life begins with the combination of sperm and eggs. In order to achieve contraceptive effects, it is necessary to find ways to prevent encounters. The strategy adopted for safe period contraception is to calculate the appearance time of the egg and the possible fertilization time, so that the sperm can avoid these times and move again.
There are some rules in the process of ovulation and fertilization. Generally healthy women ovulate regularly every month. For women with a menstrual cycle of 28 days, the ovulation date is approximately 14 days before menstruation. Eggs are discharged 1-2 days, and sperm enters the female vagina for about 3 days. Based on these patterns, we can roughly determine the risk period for pregnancy through a woman's physiological cycle, with the remaining time being the so-called safe period. In an "ideal state", engaging in sexual activity during the safe period will not cause sperm and eggs to meet, thus achieving contraceptive effects.
2. I want to calculate the quasi safety period and basic character traits
The principle of safety period may sound quite reliable, but in reality, the so-called ideal state does not exist, so it will face many difficulties in calculation.
The safety period calculation method we often hear is a simple estimation like "first seven to eight" or "first three to four", but it is only calculated based on the most recent menstrual cycle. In order to accurately calculate this algorithm, a woman's physiological cycle must be as accurate as a clock. In fact, not all women ovulate regularly, and even women who ovulate regularly have their physiological cycles affected by their environment, emotions, and health status, which cannot be guaranteed. Therefore, such calculations can bring significant errors.
In order to reduce this error, there are also some more accurate methods for calculating the safety period, such as the Augino formula. This method should record the menstrual cycles of the past 6 to 12 months, and select the values of the longest and shortest cycles as important parameters to calculate the safety period. The definition of menstrual cycle is from the first day of menstruation to the day before the next menstrual cycle.
This method is more reliable than simple estimation. Because the longest and shortest values of multiple cycles seem to smooth out the fluctuations of the cycles. However, it is very cumbersome to use, and even so, it cannot escape the influence of uncertainty, and the calculation cycle is almost a small probability event. Safe period contraception is basically luck and saves character.