What Causes Bad Odour And Yellow Discharge Form The Vagina?

Is there any infections that cause a woman to queef? For the past few weeks my vagina has had an unpleasant odor and i find yellowish discharge in my panties..Normally i have no odor or hardly any discharge whatsoever..it either smells somewhat fishy or urine-ish.And about the queefing..I have NEVER had a queefing problem before..it happened once in a blue moon..but ever since the smell and discharge started..ive been queefing..My first thought was that i used a sex toy that maybe hadn't been washed thoroughly and forced too much air in..but i dont know.. I have no insurace..so is there anywhere that i could go to get checked out without having a HUGE bill?