The first thing to consider is the normal pain caused by the enlargement of the uterus, which generally does not require special treatment. Secondly, we need to be vigilant that it is due to preeclampsia, patients need to take medication, surgical treatment to deal with. 1. Normal phenomenon: when a woman is nine weeks pregnant, the size of the gestational sac will gradually increase and cause the uterus to enlarge, and the enlarged uterus may form a pressure on the surrounding organs, which will lead to the symptoms of hidden pain in the abdomen. At this time, as long as the pregnant woman does not appear vaginal bleeding and other abnormal symptoms, there is no need to worry too much, pay attention to more rest in the near future, generally do not need special treatment. 2. Pre-eclampsia: If a pregnant woman experiences vague pain in the abdomen accompanied by a small amount of vaginal bleeding, she should be alert to pre-eclampsia. This phenomenon is mainly due to abnormal embryonic development, pregnant women suffering from severe anemia, heart failure and other basic diseases, or the presence of luteal insufficiency and other factors. At this time, pregnant women need to seek medical attention as soon as possible, under the guidance of the doctor to take dextroprogesterone, progesterone and other progesterone drugs for fertility preservation treatment. If the effect of drug treatment is not good, or even the amount of vaginal bleeding worsens, or ultrasound examination of the fetus is not well developed, usually means that it is not possible to preserve the fetus, and at this time, the pregnant woman may need to terminate the pregnancy through surgical procedures, such as hysterectomy. It is recommended that pregnant women with vague abdominal pain in the 9th week of pregnancy should seek medical examination as soon as possible to identify the specific cause, and if it is due to preeclampsia, they should be actively treated with fertility preservation.