It is not usually the case that the sperm combines with the egg after seven days. Under normal circumstances, the length of time for the sperm to combine with the egg is not the same, mainly with the speed of the sperm traveling has a certain relationship, if the sperm traveling faster, usually a few hours can be combined with the egg, but traveling slower, it may take 1~3 days, and the combination of the egg. In addition, sperm can survive for 72 hours in a woman’s body, mostly because the environment in a woman’s body is not suitable for sperm to survive for a long time. Sperm survive for 7 days in a woman’s body, basically there is no possibility of survival, and more than likely will not be combined with the egg. Therefore, in most cases, there will not be a situation where the sperm combines with the egg after 7 days.