"i hope my experience helps someone. i&#039;m 20 years old and had unprotected sex with my boyfriend on 11/04. it was about one week after my period had ended on 10/27 and technically during my sugar pill week. however, i missed a few pills during my month and knew i was not fully protected. the morning after i experienced bright red bleeding and feared that it may have been implantation bleeding (unlikely). i panicked and took plan b 48 hours after. my period was one week late and came on 12/04, ~ one month after i took plan b. i experienced extreme tiredness, swollen breasts (increased a cup size), cravings and light cramps all similar to pregnancy symptoms! don&#039;t panic. allow your body to adjust there&#039;s a great chance you aren&#039;t pregnant!"