A little blood after seven weeks of IVF may be a normal physiological phenomenon caused by embryo implantation, or it may be a pathological phenomenon such as pre-miscarriage. 1 Physiological phenomenon: . When the embryo is implanted, it stimulates the endometrium, resulting in a small number of blood vessels in the endometrium cracking and a small amount of vaginal bleeding. Vaginal bleeding at this time is a normal physiological phenomenon of embryo implantation, do not worry too much. 2. Pathological phenomenon: bleeding after seven weeks of IVF, if the vaginal bleeding is accompanied by abdominal pain, lumbar sleepiness and other symptoms may be the occurrence of preeclampsia, absolute bed rest, under the guidance of the doctor to protect the fetus. Bleeding a little bit after seven weeks of IVF, you should go to the hospital in time for examination and treatment under the guidance of the doctor, don’t stop the medicine without authorization to avoid adverse consequences.