WHOLE WEEK OF BLEEDING AFTER PLAN B ! PLEASE HELP

Elena

I took Plan b 4 days before my predicted ovulation. About 5 days after I began spotting red and brown blood.. today marks day 7 and I am still spotting and bleeding a little bit. I am so confused and concerned I don’t know if I should see a doctor

:( PLEASE HELP! Does anyone have any reference on when my next period would be ?