The afternoon of the 13th day of transferring blastocysts is allowed to draw blood to measure HCG, if the transferred embryo is 3 days old, it is recommended to draw blood to measure HCG on the 14th-16th day, and the specific checking time needs to be determined according to the doctor’s explanation. How long can you take blood for HCG after IVF transfer depends on the type of embryo transferred. If a woman has a 3-day embryo transferred, come to the hospital 14-16 days after the transfer procedure to recheck the HCG value. If a woman is transferring a blastocyst, as it has been cultured in vitro for 5-6 days, she usually comes to the hospital 12 days after the procedure to check the HCG value to determine whether she is pregnant or not. Don’t have excessive psychological burden after IVF transfer, worrying too much about whether the embryo can be implanted or not will affect the result instead. Be sure to take your medications and checkups as prescribed by your doctor after the transfer.