Idk what this means

So for some reason, my period is over two weeks late. My boyfriend and I haven't done anything recently that would explain why I'm this late and I've haven't had sex. I have realized that I'm very emotional though and my breasts are slightly sore. My period is pretty regular and has pretty consistent time in between each one. I haven't ever gone this long without having one. I'm not even that stressed either. Im not necessarily worried about it I just don't know what it means or how long I should wait before seeing a doctor or about it.