Pain on the left side of the implantation is not necessarily ectopic pregnancy. The pain on the left side may be caused by gynecological inflammation: for example, inflammation of the adnexa or urinary tract infection, urinary stones, or digestive system diseases may cause pain on the left side of the lower abdomen. For women with left-sided lower abdominal pain must go to the hospital as soon as possible to check, clear what causes the left-sided lower abdominal pain. If you want to rule out whether it is caused by ectopic pregnancy, you need to go to the hospital to check the gynecological ultrasound. Gynecological ultrasound in the uterine cavity found a gestational sac to rule out the possibility of ectopic pregnancy, if the gynecological ultrasound in the uterine cavity did not find a gestational sac, in the uterine cavity outside the detection of a suspicious pregnancy mass, this situation is caused by ectopic pregnancy.