took plan b worried. HELP

This is my 4th time taking plan b in my life and And I'm 15 and I know that sounds really damn irresponsible but 😣😣😣 anyways usually when I take his pill I have major cramping side affects this time I did not ? Is the pill still doing its job if I'm not getting that many side affects? Maybe I had slight cramping right after I took I'm not sure