If you have intercourse before the lavage, it is recommended that you should not have the lavage and consider having the lavage again next month. If you have a hydrosalpinx while having intercourse, the following situation may occur clinically: slight adhesions in the fallopian tubes are found during the hydrosalpinx, and the fluid enters the tubes to separate the local adhesions and make the tubes open. Once ovulation occurs, the sperm and egg will unite to form a fertilized egg, which will enter the uterine cavity and become pregnant. After the lavage, appropriate medication is often given to prevent infection, some of which may affect the fetus, so termination of pregnancy is recommended if the medication taken has the potential to cause malformation to the fetus.