Why do the fetal movements and contractions become more frequent after an ultrasound?

Fetal movements and contractions become frequent after having an ultrasound, which may be a normal phenomenon, or it may be due to intrauterine hypoxia of the fetus.
Fetal movements and contractions become frequent after having an ultrasound, the number of fetal movements increases but with rhythmicity, frequent contractions are stomach tightening and hardening, not accompanied by vaginal bleeding, abdominal pain and other symptoms, is generally a normal phenomenon, you can first observe, more bed rest may improve the symptoms.
After the big row after the fetal movement is more frequent without rhythmic, may stimulate the uterus, uterine contractions become frequent phenomenon, this time to consider is the possibility of intrauterine hypoxia, such as the umbilical cord around the neck, the umbilical cord torsion and other reasons, there is a different kind of fetal movement can go to the hospital to review again.
After pregnancy, more observation of the body performance, there are abnormalities should consult a doctor in a timely manner.