Final answer:
The most accurate diagnostic method for ectopic pregnancy is laparoscopy, as it allows for the direct visualization of the ectopic tissue.
Step-by-step explanation:
The most accurate diagnostic method for ectopic pregnancy is laparoscopy. While ultrasound and blood tests for human chorionic gonadotropin (hCG) levels can suggest the presence of an ectopic pregnancy, laparoscopy allows for direct visualization and is definitive in the diagnosis. A pelvic exam can also provide supporting evidence but is not definitive, and ultrasonography is the safest and least invasive imaging technique used during pregnancy, widely applied in managing fetal growth and various medical conditions. However, when it comes to an ectopic pregnancy, the visualization provided through laparoscopy is the most reliable for diagnosis.