My cycle is 35 days long the bleeding lasts for 5 days Last month I took Plan B had two periods the same month now I am three days late is this normal?

Can occur. Potential Side effects w emergency contraception include menstrual flow changes (spotting, bleeding, early or late period). Take pregnancy test & notify Dr if your period is 7 or > days late. You need more effective birth control so you don't keep using emergency contraceptives.