Miscarriage on the 4th day of pregnancy has symptoms such as irregular vaginal bleeding, irregular pain in the lower abdomen or lumbar back sleepiness. 1. Irregular vaginal bleeding: when miscarriage occurs on the 4th day of pregnancy, the embryo and fetal membranes separate from the uterine wall, showing irregular vaginal bleeding, most women bleed less, and bleeding more than the usual amount of menstruation, which is considered to be an inevitable miscarriage. 2. Irregular pain in the lower abdomen: when miscarriage occurs on the fourth day of pregnancy, the uterus will contract under the stimulation of the blood and the peeled embryo, and the process of discharging the embryo will be accompanied by a paroxysmal sensation of pain in the lower abdomen or lumbar and back distress, and the pain is usually irregular. If the pain is severe then there may be an inevitable miscarriage. If you are pregnant with a miscarriage, you should go to the hospital in time to avoid any adverse situation for the mother and child.