Is it normal for pregnancy reactions to disappear in the second trimester

It is normal when the pregnancy reaction disappears in the second trimester but the embryo develops well on ultrasound, and it is abnormal when the ultrasound suggests the embryo has stopped.
Early pregnancy hormone levels rise, most pregnant women will be about 6 weeks after menopause nausea, vomiting and other early pregnancy reactions, most of them will disappear at about 12 weeks on their own. However, some pregnant women may also disappear in the second month of pregnancy, ultrasound suggests that the embryo is well developed, progesterone and blood HCG (human chorionic gonadotropin) levels are normal, which is a normal physiological phenomenon.
However, when the embryo stops developing, the pregnancy reaction will disappear in the second trimester, and the ultrasound will indicate that the embryo stops developing, and the progesterone and blood HCG levels are low, which is abnormal, and the pregnancy needs to be terminated in time after a clear diagnosis is made.
Occasionally, embryonic failure can be prepared after the next menstrual period, but when multiple failures occur, the cause needs to be identified and treated under the guidance of a doctor before preparing for pregnancy.
When the pregnancy reaction disappears in the second month of pregnancy, you need to go to the hospital to find out the cause and treat it promptly.