Period or ovulation or wtf !

So I know its normal to spot after your period old blood or to spot during ovulation, which once in a while I will spot but it’ll be 2 days max & very lightly where I can use a panty linear BUT since Wednesday I started spotting old blood & it has continue til today even ! It’s has got a little heavier where now I’m using an actual pad & the blood has lighten but still dark blood. What could it be ? Should I be concerned?