If you are standing or sitting in certain positions, gas from the back end can move under your body and seem to come out the front. Are you sure the gas is actually coming out of your vagina, and not your anus and then just travelling frontward and upward?
Hi. Being a woman is rough, I tell you. I get it. This problem is embarrassing. I will tell you that BV is highly resilient and lots of women take more than one round of antibiotics to get rid of it. So, if you were diagnosed with that, maybe this is the situation. I don't know how old you are but something else that happens to a lot of us is vaginal prolapse and that also can be involved in this situation for some. When is your next visit to your ob/gyn?