Smelly vagina

Lately I feel like my vaginas has been smelling nasty. I know vaginas naturally have a smell and I mean my smell wasn’t bad but now it is. I don’t feel itchy and my boyfriend has never came in me (I’ve heard this throws off your ph). I wash with warm water and I use unscented soap, not inside my vagina obviously so i have no idea what it could be /: does anyone know what I can do about this smell??