maribel7, Are you sure you did not forget a tampon in there?
It is an infection of some sort. The best thing to do it to see your doctor to determine what type of infection and how yo treat it. A smelly discharge is normally a bacterial infection that should be treated with antibiotics.
Only wash with plain water down there, between the folds and under your clitoris hood. And soap you use might be part of the problem.
Best of luck!