5-6 days Blastocysts can usually be implanted in about 3-5 days, but due to different conditions of the organism, the actual time required will vary, so it is recommended to judge according to one’s own actual situation. In vitro fertilization needs to cultivate the blastocyst in vitro for a period of time, and then transfer it to the uterine cavity through medical means to continue to implant and grow, during this period, it is also required that the thickness of the uterine lining should be in line with the time for the implantation of the blastocyst, and there are enough nutrients inside the uterus to supply the growth of the blastocyst, so as to make the blastocyst implantation successful, and this stage usually takes about 3-5 days. It is recommended that women pay more attention to the changes in their own body during this period, ensure the nutritional supplementation of the body, and keep a relaxed mood. During pregnancy, it is necessary to pay attention to the prenatal examination, and actively listen to the professional doctor’s advice to do a comprehensive care and health care work. During pregnancy, pay attention to rest, at the same time should be relaxed, avoid tension, anxiety, any discomfort should be timely to the hospital, the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.