Having a child is a major event in life, but some of you have become pregnant without realizing it and have taken medication without warning, only to find yourself in a dilemma after realizing it: you are worried about the effect of the medication on your child if you continue the pregnancy, but you are reluctant to terminate the pregnancy. What can future mothers do to avoid this painful situation? The best choice is to learn more about pregnancy and observe the changes that occur in your body. As we all know, pregnancy begins with the union of sperm and egg – the fertilized egg. The fertilized egg grows rapidly, forming a blastocyst on the 5th day of fertilization and dividing into an inner cell mass and a trophoblastic ectoderm. On days 6-7, implantation into the uterus is completed by the action of the trophoblast ectoderm. At this time, the trophoblast ectoderm of the embryo begins to secrete chorionic gonadotropin (or HCG). Thereafter, the embryo grows rapidly and HCG secretion increases exponentially, stimulating the corpus luteum to form the corpus luteum of pregnancy, which secretes large amounts of estrogen and progesterone. Generally speaking, the following symptoms will appear one after another after pregnancy: 1. Menopause: Menopause is the earliest and most important “signal” of pregnancy. The average menstrual cycle is 28-30 days, 5 days early or late is normal. If you are a woman of childbearing age, have regular menstruation, have a history of sexual life, the first thing you should think about is the possibility of pregnancy when you have a menstrual period. If your period lasts more than 10 days, then it is highly likely that you are pregnant. If your menstrual cycle is irregular, then you also need to check if it is combined with other signs, such as pregnancy reactions. 2. Pregnancy reaction: dizziness, weakness, drowsiness, coldness, loss of appetite, varying degrees of nausea, paranoia, love of sour food or aversion to greasy food and special odors after menopause suggest a pregnancy reaction, indicating that you may be pregnant. Pregnancy reactions mostly start to appear around 6 weeks of gestation, aggravated in the morning on an empty stomach, and the symptoms usually disappear gradually after 12 weeks of gestation. Pregnancy reactions are associated with an increase in human chorionic gonadotropin (HCG), and the most severe period of pregnancy reactions is when the levels of this hormone are highest in the body. Some women, not knowing the general knowledge of pregnancy reaction, mistakenly think that they have a “cold” or develop gastrointestinal disorders, etc., and take cold medicine or medication for digestive tract, which adversely affects fetal development. Therefore, for those who are overdue for menstruation and have the above-mentioned symptoms, it is important to first determine whether you are pregnant and avoid taking drugs indiscriminately when the situation is unknown. 3.Basal body temperature continues to rise: Normally, a woman’s body temperature is low in the pre-ovulatory period and rises 0.2℃-0.4℃ after ovulation. If your menstrual period has been delayed and the high temperature of the basal body temperature is more than 20 days and remains high, you are most likely to be pregnant. 4.Other: After the symptom pregnancy, under the joint stimulation of large amount of estrogen and progesterone secreted by the corpus luteum of pregnancy, the breast gradually grows, swells and pains, the color of nipple and areola part deepens, and there are dark brown nodules around the nipple and other phenomena, which also suggest that you may be pregnant. In addition, after pregnancy, the enlarged uterus presses and irritates the bladder, resulting in self-conscious symptoms such as frequent urination. In individual patients, there will be slight abdominal pain, which is caused by the uterus filling with blood, distending and pulling the ligaments of the uterus, causing pain. II. Diagnosis and diagnosis of pregnancy It is not difficult to diagnose pregnancy, the key is to think about the possibility of pregnancy. The simplest method is the pregnancy test, which is also the most important test for early pregnancy. Blood HCG can be detected at about 30 days after menopause. The most common test used today is the urine pregnancy test, which is a rapid test for early pregnancy. The end of the test strip with the Max marker is inserted into the urine being tested and left flat for a few moments. 20-30 seconds later, if a purple-red band appears on the test strip, which is the control line, it is negative (not pregnant); if two purple-red bands appear on the test strip, which is the detection line, it is positive (pregnant). The presence or absence of the purple band and its shade indicate the amount of chorionic gonadotropin in the urine of the test subject, so it is best to use morning urine, which is more concentrated and has high hormone levels. This method has the advantages of being easy to use, sensitive and accurate, and can detect pregnancy 14 days after conception, with an accuracy rate of nearly 95%. In addition, you can also go to the hospital for examination, such as ultrasound examination, at 5 weeks of pregnancy, you can see the enlargement of the uterus and the echogenic image of the gestational sac in the uterine cavity, and at 7 to 8 weeks of pregnancy, you can see the beating of the fetal heart and fetal movement. This is the most reliable evidence to diagnose early pregnancy. Gynecological examination, cervical mucus smear, and progesterone withdrawal test can also help to diagnose pregnancy. It is said that you should not fight unprepared battles. Once you have overdue menstruation, you are advised to visit the hospital as soon as possible to confirm the diagnosis as soon as possible so that you can prepare early and devote yourself to the process of conceiving a baby.