II. R/O Ectopic
2. R/O Ectopic: based on results of U/S→3 possibilities: If U/S shows ectopic, call gynecology. If U/S showsIUP and no concern for heterotopic, evaluate for SAB. If U/S is indeterminate, classify into non-diagnostic or abnormal pregnancy based on β-HCG level.1
3. U/S criteria for IUP (see below for normal u/s appearance in pregnancy)