How do you know if its BV or normal odor?

I've seen a lot of posts on here about bv and maybe I'm just being paranoid but idk. I haven't had any pain when peeing or abnormal discharge. But I do have a little odor? Idk if it's a normal odor tho? I took a shower around 2 today and put on some panties and leggings after, wore them the rest of the day, and now the crotch of my leggings have an odor? But I only smelt it when I actually smelt the crotch of my leggings? Should I have an odor already?? Its not like I went to the gym and worked out and got all sweaty?