Ambivalent: At 9 weeks gestation by last menstrual period a transabdominal ultrasound should pick up the pregnancy. If it doesn't, it should be followed immediately by a transvaginal ultrasound. The rationale for first trimester ultrasound is to determine, whether there is one or more embryo's, whether there is a heart beat or not, and whether the pregnancy is in the uterus or outside.
Answered 1/29/2017
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