Period or implantation ?

Nadia

So my period can never be tracked because it’s always irregular. So i never know quite what day i am ovulating. I was supposed to get my period the 11th, took a test on Monday (it was neg) and yesterday i had some brown spotting so i thought my period was coming. No cramps, and no flow, my usual period is HEAVY LIKE SUPER HEAVY AND PAINFUL. Today in the morning i have no blood at all !! so i’m confused could this be implantation even tho i’m supposed to be on my period? I got a negative on Monday tho :/