It is possible to tell someone before the third trimester of pregnancy. There is no medical statement that says you can’t tell anyone until you are a few months pregnant. It is purely a superstition without any scientific basis to say that you can’t tell anyone before the third trimester of pregnancy, and there will be no effect on the pregnant woman or the fetus after you tell someone. The main thing after pregnancy is to avoid contact with harmful substances, less late at night, keep enough sleep. Balanced diet, appropriate increase in high calcium, high protein food to promote fetal growth and development. The third trimester of pregnancy also needs to supplement folic acid tablets to prevent the occurrence of fetal neural tube malformation. You also need to do regular labor and delivery checkups during pregnancy. If there are abnormalities such as abdominal pain or vaginal bleeding, you need to go to the hospital as soon as possible to avoid delays.