How To Calculate Your Safe Fertile Periods

Is contraception during safe periods reliable? Many women are accustomed to relying on the "safe period" for contraception, but in fact, the chance of pregnancy during the safe period is not 0%! This article will teach you how to calculate the safe period, answer frequently asked questions, and share adult product recommendations to help you enjoy your intimate life more safely and happily.

1. What is the safety period? What is the relationship between girls' safe periods and contraception?

(1) Before understanding women's safe periods, first have a deep understanding of the menstrual cycle

The menstrual cycle is a cycle of the female reproductive system. A complete menstrual cycle begins on the first day of menstruation and does not end until the day before the next menstruation . The menstrual cycle of most women ranges from 21 to 35 days, and each menstrual period lasts from 3 to 7 days.

Menstrual cramps are the most obvious physiological manifestation in the entire cycle, but in fact, in addition to the visits of "aunt", women's bodies also quietly change with the different stages of the menstrual cycle. Next, let’s learn about the 3 main phases of the menstrual cycle:

• Menstrual period : Due to the lack of pregnancy, the endometrium will begin to shed and be discharged through the vagina, causing menstrual bleeding, which lasts for about 3 to 7 days.
• Follicular phase : Also known as the follicular phase, this phase usually lasts for 7 to 10 days. At this time, the follicles will gradually grow under the action of follicle-stimulating hormone and release estrogen, causing the endometrium to gradually thicken.
• Luteal phase : The luteal phase generally lasts 10 to 14 days. After the egg is released, the remaining follicular tissue will transform into the corpus luteum and release progesterone to maintain the thickness of the endometrium. If pregnancy does not occur, the corpus luteum will shrink. When progesterone levels drop, the endometrium will shed again and enter the next menstrual cycle.

In the menstrual cycle, "ovulation" refers to the process of the follicles in the ovary releasing eggs, and this is also the stage of the menstrual cycle from the follicular phase to the luteal phase. Ovulation itself occurs very quickly , but since there is no definite date, it can only be roughly speculated based on cycle patterns. This period is called the "ovulation period" to allow the public to roughly understand the time range when ovulation is most likely to occur.

(2) What is the safe period of menstruation? When is the safe period in the menstrual cycle?

The so-called "safe period of menstruation" actually refers to the period when it is difficult for sperm to encounter an egg, that is, the ovulation period (danger period) and other days outside of the menstrual period.

The ovulation period is the "golden fertile period". If the egg and sperm meet and combine during this period, the chance of pregnancy will be greatly increased. On the contrary, having sex during the safe period rather than the ovulation period can greatly reduce the risk of pregnancy.

2. How to calculate the safety period? Calendar calculation method to easily complete the safe period calculation in 4 steps!

Step 1: Calculate menstrual cycle length

The menstrual cycle usually ranges from 21 to 35 days. You need to start recording the number of days between the start of each menstruation , find the shortest and longest cycles, and continue to observe the menstrual cycle for at least half a year to obtain the most accurate average.

Assume that Xiaofang's shortest menstrual cycle is 25 days and the longest menstrual cycle is 31 days, and her last menstrual period was August 1st. Next, let us calculate her ovulation period (danger period) and safety period.

Step 2: Day 1 of the danger period = shortest period − 18 days

Take the shortest period number and calculate the first day of the danger period using the formula "Day 1 of the danger period = shortest period - 18 days".

Xiaofang's shortest menstrual cycle is 25 days, and the formula is "25 - 18 = day 7". Counting 7 days from August 1st, the starting date of the dangerous period is August 7th.

Step 3: The last day of the danger period = the longest period − 11 days

Take the longest period number and calculate the first day of the danger period using the formula "last day of the danger period = longest period - 11 days".

Xiaofang's shortest menstrual cycle is 31 days, and the formula is "31 - 11 = day 20". Counting 20 days from August 1, the last day of the danger period is August 20.

Step 4: Find the dangerous period. Outside the dangerous period is the safe period.

The dangerous period is the number of days between the start date and the end date calculated in the above steps, and the other days outside the dangerous period are the safe periods.

In addition to using the calendar calculation method to calculate the safe period, we can also detect changes in women's physiological values ​​to determine the state of the menstrual cycle. Here are some common detection methods.

3. Not only the safe period calculation method for menstruation! Let's learn about 3 safe period detection methods together

(1) Ovulation-related hormone detection

Before ovulation, lutein-stimulating hormone (LH) rises rapidly and reaches a peak, called the LH surge. Women can use commercially available ovulation test strips to detect LH levels in urine to understand the timing of ovulation and calculate the safe period.

(2) Basal body temperature detection

Basal body temperature refers to the body temperature after adequate rest and before activity. The day before ovulation, the basal body temperature will drop by about 0.1 to 0.2°C. After ovulation, due to the secretion of progesterone, the body temperature will rapidly rise by about 0.3 to 0.5°C, and Continue until the end of this menstrual cycle. It is recommended to measure immediately after getting up in the morning, record the changes in basal body temperature every day, and use the calendar calculation method to calculate the safe period more accurately.

(3) Other physiological signs

Before and after ovulation, vaginal discharge (leucorrhea) will increase and become thinner and slimier. This is a natural phenomenon during ovulation. In addition, some women may experience chest swelling or pain in the lower abdomen during ovulation, and may even have slight spot bleeding. Observing whether the above signals appear in the body will also help to grasp the timing of ovulation.

4. Is anyone pregnant during the safe period? The chance of pregnancy during the safe period may be higher than you think!

Research findings, using the calendar calculation method to calculate the safe period and continuing to practice safe period contraception, the pregnancy rate after 13 cycles is 4.8%, which is about 7% lower than the general pregnancy rate of 11.96%. Such data proves that having sex without taking other contraceptive measures during the safe period can only "reduce the chance of winning" but is not completely "safe".

Therefore, if there is no pregnancy plan, it is still recommended to take contraceptive measures even during the safe period, and do not take risks just to pursue the stimulation of "without a condom".

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5. Is the calculation method of "seven before and seven after" safety period reliable? List of Frequently Asked Questions about the Safety Period

(1) Is the calculation method of the "seven before and seven after" safety period reliable?

The safe period "seven before and seven after" is a simple calculation method. It takes the first day of menstruation as the basis and calculates 7 days forward and backward. This period is regarded as the "safe period" when it is relatively difficult to get pregnant. .

Although the calculation method of "seven before and seven after" is simple, its accuracy is lower than the more rigorous calendar calculation method. For women with irregular menstrual cycles, the reliability of the calculation of "seven before and after" will be even greater. discount.

(2) How to calculate the safe period if menstruation is irregular?

If a woman has irregular menstruation, it is recommended to continue to record menstrual cycle data for at least half a year, including the length of the cycle, changes in basal body temperature and changes in secretions, so that a relatively accurate safe period can be calculated to a certain extent.

However, due to the greater risk of error caused by irregular cycles, it is still not recommended that women with irregular menstruation rely solely on safe periods for contraception.

(3) Is the safety period before or after ovulation "safer"?

Since sperm can survive in a woman's body for 2 to 3 days, if ovulation occurs early, there is still a high risk of pregnancy even in the safe period before ovulation. In comparison, If sexual intercourse without contraception occurs 2 days after ovulation, the chance of pregnancy is only 1.1%, so the safety period after ovulation is relatively "safe" .

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