知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 Throughout early blastocyst advancement, fluid begins to fill embryo. The embryo begins to grow like a balloon. To implant, the embryo have to escape from the shell surrounding it. This is referred to as "hatching." You could be prescribed birth Regulate drugs or injections before beginning IVF. https://www.ivf.com.mx/