How to check with B ultrasound is ectopic pregnancy

After diagnosis of pregnancy can be ruled out by b-ultrasound examination of ectopic pregnancy. In b-ultrasound examination, if found in the uterine sac, it represents intrauterine pregnancy. If found outside the uterine sac, it belongs to ectopic pregnancy. Suggestions: if ectopic pregnancy, the need to terminate pregnancy in time, otherwise it will cause massive bleeding.