Spotting but no abdominal pain at 7 months pregnant?

Pregnancy is a very special period for women, and regular prenatal check-ups are also very important, especially when the months are older. Some women experience spotting when they are seven months pregnant, but their stomachs do not hurt. This is generally due to a low placenta or premature birth. However, no matter what the situation is or what causes the spotting, it is best to go to the hospital for treatment in time to avoid immeasurable consequences.

Can a low-lying placenta result in a normal birth?

After 28 weeks of pregnancy, the placenta attaches to the lower part of the uterus, and the lower edge of the placenta even reaches or covers the internal os of the cervix. Its position is lower than the presenting part of the fetus, which is called placenta previa. Placenta previa is a serious complication of late pregnancy and a common cause of heavy bleeding in late pregnancy and during delivery. When diagnosing placenta previa by B-ultrasound, the gestational age must be taken into account.

In the second trimester of pregnancy, before 28 weeks of pregnancy, the placenta occupies half of the area of ​​the uterine wall, so there is a greater chance that the placenta is close to or covers the internal cervical os. In the late pregnancy after 28 weeks of pregnancy, the area occupied by the placenta is reduced to 1/3 or 1/4 of the uterine wall. The formation and extension of the lower uterine segment increases the distance between the internal cervical os and the edge of the placenta. Therefore, the placenta originally in the lower uterine segment can move upward with the uterine body and change into a placenta in a normal position.

Therefore, many scholars believe that if placenta previa is found during B-ultrasound examination in mid-pregnancy, it should not be diagnosed as "placenta previa" but should be called "placenta previa state". B-ultrasound should be checked every 4 weeks or so. If there is vaginal bleeding, B-ultrasound should be checked in advance so that the doctor can make appropriate treatment in time.

If placenta previa is diagnosed and there is no vaginal bleeding or only a small amount of vaginal bleeding, the gestational age should be extended to 36 weeks as much as possible while ensuring the safety of the pregnant woman. Because after 35 weeks of pregnancy, the frequency of uterine physiological contractions increases, and the bleeding rate of placenta previa increases significantly, the risk to pregnant women and fetuses increases. Therefore, doctors will detect fetal lung maturity at 36 weeks of pregnancy in pregnant women with placenta previa and choose cesarean section to terminate the pregnancy when appropriate.

Causes of low-lying placenta

1. Endometrial lesions in the uterine body, such as puerperal infection, multiple births, multiple curettages and cesarean sections, cause endometritis or endometrial damage, resulting in incomplete growth of vascular vessels in the uterine decidua. When the fertilized egg is implanted, the blood supply is insufficient, and the placenta area is expanded to extend to the lower part of the uterus in order to absorb sufficient nutrients.

2. The placenta area is too large. For example, the placenta area of ​​twins is larger than that of a single fetus and reaches the lower part of the uterus. The incidence of placenta previa in twin pregnancies is twice as high as that in single pregnancies.

3. Placental abnormalities such as accessory placenta: the main placenta is in the body of the uterus, while the accessory placenta can reach the lower part of the uterus near the internal os of the cervix.

4. Slow development of the trophoblast of the fertilized egg. When the fertilized egg reaches the uterine cavity, it has not yet developed to the stage where it can implant and continues to migrate into the lower segment of the uterus, where it grows and develops to form a placenta previa.