Back pain at 11 weeks of pregnancy does not lead to embryo termination, but if it lasts longer it may cause embryo termination. At 11 weeks of pregnancy the uterus is enlarging and may be pressing on the nerves in the lower back, which may cause pain. If the pain is mild and there is no vaginal bleeding, and the ultrasound examination shows that the embryo is developing at the right size for the gestational period, this will not lead to embryonic decontamination. If the lower back pain is more serious and the blood HCG level drops, the value of progesterone is lower than 10ng/ml, the development of the gestational sac under the gynecological ultrasound is smaller than the gestational week, and there is no fetal heartbeat at any time during the dynamic detection, it is more likely that embryonic sterilizations will occur and need to be terminated at the earliest possible time.