Smell down there

I have this musky smell that is brought on within like 3 hours after showering. If I put my finger along my clit or down the side of my labia it smells the very slightest bit like fish. Nothing over powering tho and it’s not bv. Ive done down research and I’m convinced I’m lacking lactobacillus down there. I have probiotics but I simply can’t afford to use a box a month..I used to be able to take 3 a week and be fine. Can anyone suggest natural things to put down there ( on the outside obviously) or things to drink which will help this issue. It’s nothing that completely worries me but I’m always self conscious for when my partner goes down there as I know I COULD be smelling like faint fish.