abnormal bleeding?!

so i’ve been on the pill for a while now. but i’m bad at taking it on time regularly. i always have leftovers in my pack... this month i got my period twice! i woke up to heavy bleeding this morning, but my last period ended a week ago. i’m worried, could i be pregnant? could it be my hormones being thrown off by taking my pills irregularly? i also took 2 plan b pills within the last month as well. is this common, do you ladies experience this too?