Under rib pain already???

Hello! I'm 16w+5 and have been having crazy under rib pain, primarily under my left, so first I look it up and it says spleen, then I look up the same thing "while pregnant" and everything basically says its from stretching and possibly kicking? I feel quickening all the time but not definate kicks and I read the uterous isn't even above the belly button yet so I'm just curious any other mamas having this pain this early? I'm getting concerned.