High arterial pressure in the uterine arteries during pregnancy and the use of aspirin does not usually affect the fetus, subject to medical advice. High resistance to blood flow in the uterine arteries during pregnancy can lead to elevated arterial pressure, resulting in insufficient blood supply to the uterus, a condition that can easily lead to recurrent miscarriages, blood clots during pregnancy, and embryonic arrest. Aspirin can reduce the resistance to blood flow in the uterine arteries, which is more conducive to the blood supply and oxygenation of the embryo, and reduces the probability of embryonic arrest, miscarriage or developmental abnormalities. Pregnant women taking aspirin as long as the dosage is strictly controlled under the guidance of a doctor, the general effect is not great, and the benefits outweigh the drawbacks for pregnant women and fetuses, the therapeutic effect is safer. In addition, usually pay attention to regular pregnancy tests, so that the doctor can see whether they need to adjust the dosage according to their own situation. Any other abnormalities can also be timely intervention to avoid delays. The use of drugs during pregnancy should be under the guidance of a doctor, do not take on your own.