To keep you safe
Ectopic pregnancies are somtimes hard to locate.
They also are life-threatening if not caught in time. Your doc has probably determined that it is safer to perform a laparoscopic procedure to visually evaluate your pelvic organs, make sure an ectopic is identified early & treated if needed. A salpingostomy can be performed (open the tube & remove the ectopic) which spares your tube if undamaged.