New Smell Down There

So around a mouth or 2 ago, I started to notice a unusual smell down there. I had nasty discharge 'cottage cheese' like, so I came to the conclusion I had a yeast infection. I went to the store and got treatment for it. My discharge is back to how it used to be, but the smell remains. 😐
My boyfriend and I started having sex not to long before this, he's uncircumcised (I've never been with am uncircumcised man before) so I'm not sure if he could have caused a change down there for me?? Or if that's totally irrelevant to my problem lol. But I have no itching or redness done there, just the sour smell. I also have a new taste down there... Taste the way it smells. Any help? What should I do? Causes? Thanks.