After my last period I saw some discharge so I went to the doctors and they told me that it was trich, so after examination my doctor came back with only 4 pills of the metronidazole 500 mg and told me it should be gone within 3 days. I didn't even know there was a seven day treatment so why wasn't I prescribed a seven day treatment? And I'm going into my 3rd day and I'm still seeing discharge, could the infection still be there?