Urine Odor

Hi all. Lately everytime I pee, it has a very strong smell to it. At first I thought it might be a bladder infection because I was kinda getting that burning sensation, but that went away and the smell is still around. Sometimes my urine is really dark too. I just started having unprotected sex with my boyfriend, so I don't know if that has anything to do with it. Does anyone have any suggestions on what this could be and what I can do to get rid of it?