Just pregnant can you do B ultrasonic examination

Just pregnant can do B-ultrasound examination; generally in pregnancy about five weeks can be found through B-ultrasound examination in the uterus pregnancy ring; but it is best to do B-ultrasound examination about 50 days after menopause, can help determine whether the gestational sac size and menopause days are consistent; if there are no special circumstances, it is not recommended to do B-ultrasound examination frequently during pregnancy.