Hi, I Am Experiencing Some Itchiness In The Vaginal Area.

Hi, I am experiencing some itchiness in the vaginal area. The itchiness only occurs when I usethe restroom.I went to my local gynecologist and I gave a urine sample that came back negative of anything abnormal. I also got a pelvic exam and the dr took a sample from that exam and that came back negative of anything abnormal as well. The Drsaid she did not see any cuts, bumps or a rash. She suggested I try monistat and It helped for about 2 wks but now it is back. I was sexually active in Novemberfor the first time and haven't been sexually aactive since and we used protection.could it be a latexallergy or std?