What should you know about isthmic ectopic pregnancy?

The isthmus lies close to the uterus and has limited space for an implanted pregnancy. Clinicians combine symptoms, pregnancy hormone measurements and ultrasound findings to locate the pregnancy and check for internal bleeding. A [Transvaginal Ultrasound](/treatments/diagnostics-and-imaging/transvaginal-ultrasound/) may help, although very early pregnancies can be difficult to locate. Previous tubal surgery, infection or [Pelvic Inflammatory Disease](/conditions/pelvic-inflammatory-disease/) can affect tubal function, but an ectopic pregnancy can occur without these factors.

Contact an urgent pregnancy service or emergency department if you have a positive test with pelvic pain or bleeding. Do not wait for symptoms to become severe. Treatment depends on the pregnancy’s location, size and hormone pattern, your symptoms and whether bleeding is present. Options may include medicine, close monitoring in selected situations, or surgery such as a [Salpingectomy](/treatments/gynaecological-surgery/salpingectomy/). A clinician will explain follow-up and future pregnancy planning.

Call emergency services for sudden severe abdominal or [Pelvic Pain](/symptoms/pelvic-pain/), shoulder-tip pain, dizziness, fainting, marked weakness, heavy bleeding or trouble breathing. These can signal internal bleeding. Keep the pregnancy test information and medication list available, and avoid driving yourself if you feel faint.

Where is the pregnancy located, and is there evidence of internal bleeding? What do my hormone results and ultrasound show? Which treatment is safest in my situation? What follow-up is required? How might this affect a future pregnancy?