A common question asked is, “Will my embryos fall out?” The answer is no, they will not fall out.
Perhaps you are thinking of textbook illustrations that show uterine cavities as big open spaces. This is inaccurate. In reality, the two walls of the cavity are pressed tightly together, and there are microscopic folds in the surface. This, coupled with sticky secretions inside the uterus, makes it a safe place for your embryos to stay firmly put.