M.M.
Maybe it is not clearing up totally? I had this and it took almost a full month and 3 types of meds to fully clear it up. I hemorraged after my first child, they did not do a D&C because the u/s looked clear and sent me on my merry way....within a week I had Bacterial Vaginosis and as I stated it took a loooong time to fully go away.
Maybe go back for a check up within a few days of finishing the meds to have your Gyn culture to make sure the infection actually cleared.