Strange discharge

lately I have been having sudden gushes of a very watery, clear, and sour smelling liquid down there. I haven't changed any body washes, routines, and I am 100% not pregnant. when a gush of this fluid occurs, it's about half a tablespoon and I feel it happening, very weird. one day I actually wore a tampon (even though I was not on my period) to see if it would help and the problem disappeared! no pain when urinating or during sex. anyone had this problem or know what it could be?