DID PLAN B WORK: I had my period August 20-26 , 2017 . I had been on birth control for 5 months up to sept 1,2017 I then had a huge misunderstanding on refilling .before I could even get them 10 days later . Sept 10 me and my fiancé had unprotected sex however at this time I am off the pill for 9 days . The next day I take plan B I was suppose to get my period sept 20 -26 it is now sept 27th and no period can I be pregnant . I took a test and it's negitive even though it's 17 days out . Is that too soon .