How To Get Rid Of Odor In My Vagina?

my boyfriend and i have unprotected sex very often. Last month i noticed a strong odor to my vagina went to the doctor and was prescribed an antibiotic for BV. it worked and this month i am starting to notice that same odor comming back. is there anyway natural way to keep it away without the use of doctors visits and antibiotics because im thinking it could potentially become expensive