the normal vaginal odor is either odorless, or merong slight odor na hindi unpleasant. and tama na kadalasan depende sa kinakain or iniinom ang odor. kumbaga depende sa body chemistry ng tao. kapag medyo excited sexually or mataas ang hormone levels, chances are magkakaroon sya ng slight odor change. some say parang musky odor daw. normal ito, kasi it is released by our hormones again, to make us more "attractive" to men. it's what we call pheromones and syempre the vagina is not exempted. nung bago lang ako nakikipag intercourse, wala ako napapansin na ganitong scent or odor. but as my body matured, naging in tune ako and mas naging sensitive kaya minsan pag sobrang intense ng love making, meron ako nadedetect na smell down there. then it subsides after intercourse.
kapag foul ang odor. alam naman natin siguro ibig sabihin ng foul. like kahit nakaupo ka lang at bagong ligo eh may naaamoy kang fishy, pungent, mapanghi, at malakas na amoy talaga, time to have it checked. pwede din pawisin ka lang sa area na yun so hygeine lang ang sagot. pwede din naman na baguhin mo muna foods that you eat then observe kung may changes before going sa OB, para naman atleast may nagawa ka din on your part.
pagdating mo sa OB, pag first time mo, she will ask you a few questions about your menstrual cycle, number of sexual partners and children, sexual activities, lifestyle, STDs, etc. A good OB will make you feel comfortable enough so you could tell her all your concerns. una nyan kasi assessment muna, syempre she will use light to check for any discoloration, lumps, bumps, or just anything. syempre kung may foul odor, maaamoy nya on assessment pa lang so better to tell her your concern agad before lying down sa OB bed para you could talk about it, when it started, how it started, signs and symptoms, etc.
and sa TS, you probably might be over reacting based on your symptoms. hindi sya odorless, hindi din foul. but you can detect that it smells like one. so since you are familiar with that smell, chances are, it's your body chemistry you are smelling, unless you smell others' vaginas that's why you are familiar with that odor. (kidding) at your age, which is the childbearing age, increased vaginal secretion is normal. depende sa menstrual cycle how it changes its consistency, color and odor. and after menses, its normal na medyo brownish or may amoy ng konti ang discharges. but it should be clear a week after or so. ang amount kasi ng discharges ay dependent sa hormone levels mo. so again, please don't worry too much. stress causes hormonal issues din. and a lot more health concerns are attributed to stress.
ano ba talaga amoy ng vagina/vulva? again, as i've said it varies from woman to woman and a lot of factors play. age, lifestyle, diet, hygeine, hormones, etc.
regarding panty liners, don't wear one na unless katatapos lang ng period mo or ang dami mo talagang discharge which could stain your clothes. hindi sya adviseable to wear daily kasi yes, it can cause you to harbor infection or irritation down there. opt for clean and soft, cotton fabric or not too tight undies, so it can "breathe" and di pagpawisan masyado.
PS. during sex, its normal for some women to release varying types of discharges. pwedeng white na creamy or a thin colorless more liquidy discharge. related sya sa sexual excitement and again hormones. kapag masakit, mabaho, may dugo, etc. dun ka na magworry. otherwise, just relax.

pagpunta mo sa OB and you're about to ask about yeast infection, just ask straight. tell her your symptoms and she will be able to determine if you have one by assessment and the right additional tests na sya mismo magoorder.