Talk to Gynecologist on Sexologist/Gynaecologist

Married. Sometimes after having intercourse (not every time) I feel a sudden discharge from vagina(feels like water is coming out with pressure). But yesterday night It was coming again and again with intervals in a noticeable quantity for like half an hour.. What this could be and Is it normal ?? Can we say that it is sperm leakage, if yes then how to prevent it for conception??