I took plan b, bled for 3-4 days a week after. am two days late on my expected period. when should i expect to see my period?

Hard to predict...: Irregular bleeding after taking a morning-after pill, like Plan B or Ella, (ulipristal acetate) is somewhat common. Some women get spotting or bleeding before the next period. Women may also have a heavier or lighter next period, or a period that is early or late. A urine pregnancy test can be done 3 weeks after taking a morning-after pill, to be sure the pill worked.