The mechanism of pregnancy is that women's ovaries expel eggs, which are fertilized at the ampulla of fallopian tubes, and then develop into embryos (morulae) in fallopian tubes, and then the embryos are discharged into the uterus for implantation and growth.
With regard to contraception, we need to know some basic physical health knowledge that every girl should know. I wonder if you have taught at school:
Human hypothalamus secretes gonadotropin-releasing hormone (GnRH). GnRH promotes the secretion of follicle stimulating hormone (FSH) and luteinizing hormone (LH) in the anterior pituitary gland. FSH promotes the growth and development of female follicles. Under the joint action of FSH and LH * * * * mature follicles secrete estrogen and progesterone.
The levels of progesterone and estrogen in women are at the lowest level during menstruation. After menstruation, the secretion of these two hormones began to increase. The first is the rapid increase of estrogen. Before ovulation, higher estrogen level can promote the pituitary gland to secrete LH directly or through hypothalamus, leading to ovulation (positive feedback).
But after ovulation, progesterone content began to reach the peak (luteal phase). At this time, due to the high content of estrogen and progesterone in blood, progesterone reduces the secretion of GnRH in hypothalamus, thus inhibiting ovulation and inhibiting women's own secretion of progesterone and estrogen (negative feedback). Therefore, after ovulation and progesterone peak, the estrogen level and progesterone level in women will begin to decline, to a certain extent, it is menstruation. The so-called "safe period" includes luteal phase. In luteal phase, the progesterone level in women is high, so they will neither ovulate nor get pregnant.
The so-called long-acting contraceptive, its medical name is short-acting oral contraceptive. Long-acting (short-acting) contraceptives include Mindikang, Mafulong and Tejule, which means you must take them every day and for a long time. Each pill can only be taken for one day. Progesterone is really used for contraception. Another name for long-acting contraceptives is short-acting oral contraceptives. I have no choice.
Long-term short-acting oral contraceptives (MindingCouple, Marvelon, Tejule) contain progesterone and a small amount of estrogen. Among them, progesterone can reduce the secretion of GnRH in human hypothalamus through negative feedback after oral administration, thus reducing the secretion of FSH and LH, thus making it difficult for follicles in women to grow and ovulate, thus inhibiting ovulation and inhibiting the ability of women to produce progesterone and estrogen themselves. By inhibiting ovulation, its contraceptive efficiency is almost 100%. By reducing the progesterone and estrogen secreted by women themselves, the progesterone and estrogen contained in long-term short-acting oral contraceptives replace the progesterone and estrogen secreted by women themselves.
In fact, progesterone alone can achieve the purpose of contraception. The reason why long-term short-acting oral contraceptives contain a small amount of estrogen besides progesterone is to prevent the estrogen level of women from falling too much.
Because the contraceptive mechanism of long-term short-acting oral contraceptives is to inhibit ovulation, and as long as there are no eggs, fertilized eggs will not form, so long-term short-acting oral contraceptives can effectively avoid ectopic pregnancy and prevent ovarian cancer to some extent.
Long-acting contraceptives include long-acting contraceptives in addition to common long-acting short-acting oral contraceptives. Long-term long-acting contraceptives only need to be taken twice a month. But please think about it in a stupid way: if long-term short-acting oral contraceptives are equivalent to drinking two liters of water a day, then long-term long-acting contraceptives are equivalent to drinking only 30 liters of water twice a month.
I won't introduce the contraceptive needle for injection.
As I said, there are great differences between different kinds of contraceptives. One of the most harmful drugs is the morning-after pill. Due to social misinformation, many people mistakenly think that contraceptives are equivalent to emergency contraceptives. As we all know, the dose of an emergency contraceptive pill (Yuting) is equivalent to the dose of six conventional contraceptives, which will make the progesterone level in your body suddenly rise to six times the normal level, and then suddenly fall back, which is very harmful to your health. Therefore, if there is a saying that birth control pills are harmful to the human body, it must be emergency contraception afterwards.
Let's use condoms
……
If you have to take birth control pills, the most beneficial thing for your health is to take one long-acting short-acting oral contraceptive pill (Mindingdui, Mafulong, Tejule) on time every day. But you must eat on time every day, and stop for 7 days every 2 1 day (it must be so strict), and once you eat, you must eat every month endlessly. Missing or taking it irregularly will disturb the negative feedback in your body and cause endocrine disorders. If you have to take birth control pills, do you have the perseverance to take them on time every day and month?
…………
Yu Ting and Ma are not in the same sense.
As for its composition, you need to ask the manufacturer.
Yuting is an emergency contraceptive afterwards. The reason for contraception is that the fertilized egg is not implanted, and it is not negotiable to hurt you. No more than three times a year, otherwise the follow-up is very serious, second only to abortion. Its contraceptive success rate is 95%.
Mafuron is a short-acting oral contraceptive that can be taken for a long time. The reason for contraception is that it does not ovulate. Its side effects are so small now that many people don't feel them. It can be taken for a long time, and sometimes doctors will take it as a medicine to treat irregular menstruation. Many people abroad use it for contraception. As long as it is taken correctly, the contraceptive success rate is almost 100%.
A woman who knows how to love herself will not bring Yu Ting.
Finally, let me talk about ring contraception: The contraceptive principle of intrauterine device (IUD) is that when an embryo is going to be implanted in the uterus, the constantly moving IUD scratches the uterine wall, causing uterine inflammation, so that the embryo cannot be implanted in the uterus, thus causing abortion and achieving the purpose of contraception. The essence of IUD is a once-and-for-all curettage and abortion, which is the first choice for China women to have contraception after marriage.