I am taking Metronidazole to treat BV and trichomoniasis. I was told to take 4 500mg metronidazole pills the first day of treatment and 1 pill twice a day until gone ( which was 5 days) I am on the 5th of treatment and only have one pill left to take. My symptoms haven't really gone away and I've noticed an increase in yellowish discharge. Does this mean the treatment hasn't worked for me?