Routinely about 14 days after the embryo transfer, if the pregnancy will test positive for HCG, you will be able to tell if it is viable or not. Embryo transfer is sometimes single and sometimes double, so to know whether you are pregnant with a single or double baby, you need to have an ultrasound around 7-8 weeks of pregnancy. At present, the success rate of IVF is about 60%-70%. In order to improve the success rate, you can do some sex hormone tests after the IVF transfer, and at the same time, you should make up the estrogen-progestin combination, which can improve the success rate of IVF. In addition, avoid strenuous exercise after embryo transfer, you can also take a small amount of oral vitamins and appropriate amount of folic acid, avoid stimulating diet, try to eat a light diet, in order to reduce the negative factors of embryo implantation.