Cramps ?!

Just curious if anyone else has delt with this my normal period I usually get back ache and this pulling feeling in my tummy and very tired like every month except last month I cramped from July 17-25th and had spotting on July 21-23 I took test and they were all negative so I chalked it up to weird cycle right ? This month now I started cramping Tuesday and here we are Friday and I woke up to these extreme cramps I haven't had since high school but still nothing although my period isn't due it days till Sunday I have never cramped and had nothing what's going on? Weird cycles ? Is this now my new normal ? Is this something I should be concerned about ?