After 0/2 weeks of pregnancy, the embryo develops into a fetus. The fetus keeps growing up, and at the same time, under the action of hormones secreted by the placenta, the uterus becomes soft and big, and the capacity and weight of the uterus continue to increase, so that the uterine muscles and abdominal muscles of pregnant women are pulled, and the stomach will feel tight or hard.
Another reason for physiological contractions is also related to the amplitude of fetal movement. Fetal movement began to be obvious around 4 months of pregnancy and reached its peak at 28 weeks of pregnancy. If the fetal activity is relatively large, the impact on the uterine wall is relatively strong, which can also lead to physiological contractions of pregnant women.
Does physiological contractions affect the fetus? It didn't work.
Physiological contractions only show the tightness of the stomach, and pregnant women have no pain. So it is also called "painless uterine contraction". Moreover, the uterine contraction is irregular, sometimes there is no contraction, and the intrauterine pressure is very small, generally less than 2KPa, so physiological contraction has no effect on the fetus.
If the following symptoms occur at the same time of uterine contraction, it will have an adverse effect on the fetus: 1, accompanied by obvious pain during uterine contraction;
2. The frequency of contractions is getting denser and denser;
3, accompanied by vaginal bleeding symptoms.
If there are the above three manifestations during the contraction, the time occurs before 36+6, which is a sign of premature delivery. You need to go to the hospital for examination at once. Of course, if you can have children, try to have them.
The main difference between physiological contractions and regular contractions is: 1. Regular contractions began a few weeks before labor; Physiological contractions have existed since the second trimester;
2, physiological contractions are painless, and regular contractions are accompanied by pain;
3, physiological contractions are irregular, generally pay attention to rest or slightly change the same position, which can be alleviated; However, regular contractions cannot be relieved when they occur.
4. Regular uterine contraction can be accompanied by continuous expansion of cervix and descent of fetal head; Physiological contractions will not have the above symptoms.
In short, pregnant women feel hard during pregnancy, which is the performance of physiological contractions. Because there is no pain, there is no cervical dilatation and no bleeding symptoms. So it has no effect on the fetus.
I hope the above answers can help you. If you have any questions, you can leave me a message in the comments section below. Good luck with your pregnancy!