Human insemination (artificial insemination) 12 days see red is not necessarily a failure, may be physiological factors, reproductive tract inflammation, artificial insemination failure and other reasons. 1. Physiological factors, artificial insemination 12 days see red that is a small amount of vaginal bleeding, usually with artificial insemination to stimulate the endometrium or fertilized egg implantation bleeding has a certain relationship, but also may be the implantation of fertilized eggs in the body after the hormone level changes, will also cause a small amount of vaginal bleeding; 2. Inflammation of the reproductive tract, but also due to cervical inflammation or vaginal inflammation, there can also be a small amount of vaginal bleeding. You need to rest in bed, continue to take medication to protect the fetus, and pay attention to observation. If the bleeding decreases or stops, it is usually not a big problem. 3. Failure of artificial insemination, if the bleeding continues, or even more than the amount of menstruation or have obvious pain in the lower abdomen, it suggests that artificial insemination has failed. After artificial insemination, keep good mood, don’t be too nervous, take proper rest, forbid coitus, if there is vaginal bleeding or pain in the lower abdomen, consult a doctor in time, and under the guidance of a professional doctor, carry out the relevant examination, such as blood HCG test, to clarify whether artificial insemination is successful or not.