Fetal pole dating
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Normally, ultrasounds before until week 4 of pregnancy shows nothing in the uterus and serve no purpose. If the pregnancy is an ectopic pregnancy, with the embryo implanted outside the uterus in the Fallopian tube, this can be determined based on the blood flow patterns seen via ultrasound. The waiting is torture but unfortunately it's the only way to find out if your dates are out or if the pregnancy has failed.
Prediction of ectopic pregnancy in women with a pregnancy of unknown location. If the heartbeat is not detectable at this point in time then the scan should be repeated within a week.
Fetal Ultrasound Measurements - Usually, determining your baby's gestational age and your due date is calculated from the first day of your last menstrual period.