An ectopic pregnancy occurs when the fertilized egg attaches itself in a place other than inside the uterus. Almost all ectopic pregnancies occur in a fallopian tube, and are thus sometimes called tubal pregnancies.

Types of tubal pregnancy

Interstitial pregnancy 
Isthmic pregnancy
Ampullary pregnancy
Infundibular pregnancy
Fimbrial pregnancy
Cervical pregnancy
Pregnancy in a uterine diverticulum
Pregnancy in a uterine sacculation
Intramural pregnancy
Angular pregnancy
Pregnancy inrudimentary horn，pregn-ancv in a bicornuate uterus
Intraligamentous pregnancy
Ovarian pregnancy
Abdominal prgnancy
Extra peritoneal pregnancy

Diagnosis of tubal pregnancy

 --B-ultrasound, ultrasound is used to determine whether the uterus contains a developing fetus 

 --HCG. An HCG level that is over the standard of what would be expected is one reason to suspect an ectopic pregnancy. Low levels of progesterone may also indicate that a pregnancy is abnormal. 

 --Pelvic exam: a pelvic exam is performed to locate pain, tenderness or a mass in the abdomen.

Symptom of tubal pregnancy

Sharp or stabbing pain that may come and go and vary in intensity. The pain may be in the pelvis, abdomen or even the shoulder and neck (due to blood from a ruptured ectopic pregnancy gathering up under the diaphragm). 

Vaginal bleeding, heavier or lighter than your normal period 

Gastrointestinal symptoms 

Weakness, dizziness, or fainting