Weird period

Kayla

So I started my period on Sunday the 18th and I did not bleed at all last night, the 20th any time after 5:00pm or so and I didnt bleed today the 21st until about 7:30 8:00 tonight after I started working out. Is this normal? It isn't normal to me. Usually when there is no blood for that amount time I don't start bleeding till the next cycle.