If a woman is pregnant and the HCG growth is found to be slow on the next day, there may be several reasons for this: 1. The embryo is not growing well due to the poor environment of the embryo, such as the poor environment of the endometrium or the polyps in the uterine cavity. 2. The fertilized egg is not bedded in the uterine cavity at all, but in other places outside the uterine cavity, where the environment is not as good as that of the uterine cavity. 3. It is considered that the quality of the embryo itself is abnormal, so there is also a slow growth of HCG, and even embryonic abortion may occur. Therefore, for women with slow HCG growth, it is generally recommended to review the ultrasound in time to see the growth and development of the embryo.