Patients undergoing care with (1) positive serum hcg and (2) abnormal hcg trend, as defined by \<50% rise in bHCG over 48h period, repeated across three lab values.
Patients with pregnancy via unassisted conception, conception after ovulation induction and/or intrauterine insemination, and/or embryo transfer
Well established pregnancy dating, either with known LMP, or dating by IUI or embryo transfer
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Patients with known abnormal cavity (history of fibroids, septum, or uterine anomaly)
Patients who are hemodynamically unstable or with an acute abdomen
