Suggest Remedy For Sexual Health Problem

i am 34 yrs old. 6 2 and 180 lbs. my wife has been checked out by her gynecologist a couple times now because she had a strong fishy smell. no extra discharge, no other abnormalities. she was put on an antibiotic both times and symptoms cleared up each time. her gyn is suggesting that possibly i am the issue. i am otherwise healthy, no stds. her gyn suggests that i go see my primary care to get myself checked out. it might just be a matter of taking antibiotics. my question is... what could possibly be the problem and should i go see a urologist instead of my primary care doctor? thank you.