SLIGHT VAGINAL ODOR not itch no burning no discharge :(

okay im 18 years old , i lost my virginity this year in january and went to the gyno in february because i noticed i had a slight odor of something burning, i have no itching no burning and no discharge  ? when i went in february my gyno said i had a little bit of BV i did it all the cream , and then pills but only for 4 days because i couldn't berth on the pills, recently i did the vaginal screening test because i get the odor a day after having sex two weeks ago friday day after no smell , last week tuesday day after no smell , yesterday i did the test and it said my ph balance was normal 4.5 i had sex and today there a little bit of smell is this normal ? also my vagina is dry , could this smell be from too much sex in one day or becoming dry during sex but not stopping ? help me please :(