recto vaginal fistula

My question is regarding Recto vaginal fistulas. Lately I have had what I would describe as air bubbles coming out. When you have a RVF does gas come out both ends? I have no passage of feces out the vagina. Just the really annoying air bubbles for the last month. Haven't been diagnosed w/ Crohn's yet. Still saving money for the colonoscopy. Any advice would be appreciated.