I smell like fish down there but i don't have any other symptoms. should i be concerned ?

Possible BV: You most likely have bacterial vaginosis. It is a common vaginal infection that is very common. It is not an STD. It is usually happens when the PH of your vagina is disturbed. It is easily treated with a prescription vaginal cream or oral antibiotic. To know for sure, you just need to see your doctor and they can do a vaginal swab to check for clue cells which will confirm the diagnosis.