Pre-eclampsia can be detected by ultrasound. When there is a pre-eclampsia, the first symptom is stomach pain, followed by irregular vaginal bleeding and finally, back pain. These symptoms can be detected by ultrasound, which will show blood in the uterine cavity, indicating the presence of preterm miscarriage, and should be accompanied by blood tests for progesterone and human chorionic gonadotropin. If the progesterone level is confirmed to be lower, progesterone should be replenished in a timely manner, either by oral progesterone or intramuscular progesterone injection, or by taking oral dydrogesterone tablets to replenish the progesterone in the body, which can play a role in preserving the pregnancy. You should also pay attention to maintaining a relaxed mood, not to have too much stress, pay attention to bed rest, and try not to eat food that is particularly stimulating.