Pelvic pain or bleeding in early pregnancy
Recommended: Transvaginal Pelvic Ultrasound is the preferred imaging study for pelvic pain or bleeding in early pregnancy. Always β-hCG first.
Recommended study
Transvaginal Pelvic Ultrasound
Always β-hCG first. Discriminatory zone ~1500-2000 mIU/mL — if no intrauterine pregnancy visualized above this, suspect ectopic.
If the default doesn't apply
β-hCG below discriminatory zone, stable
US
Serial β-hCG + transvaginal US in 48–72 hours
No contrast
Heterotopic pregnancy (IVF context)
US
Transvaginal US with careful adnexal evaluation
No contrast
Watch-outs
Hemodynamic instability + positive pregnancy test
Assume ruptured ectopic — straight to OR; do not wait for imaging.
Pseudogestational sac
Intracavitary fluid collection without yolk sac/embryo can mimic IUP — do not confuse with a true IUP.
Pearls
- Discriminatory zone ~1500–2000 mIU/mL — if no IUP visualized above this, presume ectopic.
- ~95% of ectopics are tubal; cornual/interstitial and cesarean-scar implantations have higher rupture risk.
- Free pelvic fluid with echogenic debris suggests hemoperitoneum.