Hello dear Understand your concern As you had missed abortion naturally, some part of ectopic pregnancy may be remain inside. So because of retain product of ectopic pregnancy in Fallopian tube/infandibulum/ovary may produce pain in the left lower abdomen. It is more when pressor as you had during passing of stool. I advise you to consult the gynecologist and if retain product will found, It should be removed by surgery Take rest, healthy diet with iron supplements, analgesic. Hope this may help you Thanks and regards Dr. Sagar