What Causes Vaginal Itchiness After Urinating?

my vagina is not really itchy when i'm up and about but the minute after and while i pee it itches no burn no pain but an itch (the hole where you have your period) i'm on it right now. it just started itching a couple days ago.and after i go and get up and whip it slowly goes away and also theres like clear really bad smelling stuff thats coming out too,its not discharge or creammy or anything. just like water but it smells terrible. i have not had sex or anything and i need answers.