smells

so, ever since I got an IUD, I've smelled like fish, no matter what I wash with, no matter how much I fucking wash myself, it still smells like fish. my boyfriend doesn't even eat me out anymore because I don't let him because I'm so emberassed. before we have sex I have to go into the bathroom and make sure that I'm clean and I have to make sure that I don't smell like it too bad and nothing works I don't know what to do anymore.... HELP!!!!!!!!