Hello, I would be happy to help you with your questions.
It is possible that you have a yeast infection, but there are also other infections that can happen commonly. One of them is called BV or bacterial vaginosis
. You need to return to the doctor or ask for a second opinion
. At this visit, ask for a repeat exam and cultures.
If it is determined to be yeast, then a longer course of treatment is indicated as well as reviewing what might be the underlying cause of these recurrent problems.
I hope that this helps and good luck!