Period shorter and lighter

Has anyone had “weird periods” before? My periods would usually last atleast 5-6 days now ive been having shorter periods.. i started Friday night with just spotting then saturday morning it got heavy and has bad cramps all day, sunday was also heavy and today was just lighter and it seems to be ending now, should I be worried? Because I did think I was pregnant but since my period came I don’t think I should be stressing over it anymore.