I had sex with my boyfriend 2 days after my period ended. There was an accident so right away we went and got Plan B. Exactly a week after taking the pill I had a period that lasted 7 days. My period for that month was due around the 20th and never showed up. My period is now 25 days late. I have taken 3 tests at different times and all showed up negative. Should I go get a blood test done or is it normal to miss a period after taking the pill. I need to put my mind at ease. Thank you.