I took a plan b within a hour after intercourse which was a friday & that sunday i started my birth control & 4 days later i started to spot and its almost been a week is it normal ? & will taking plan b & my bc affect anything ?

Yes: Plan B can alter the menstrual-type bleeding for the cycle in which Plan B was taken, and sometimes the next cycle too. There can be irregular spotting, too. One should be sure to check a home pregnancy test about 3 weeks after sex, because Plan B works most of the time, but not all the time. After the second month of birth control pills, the withdrawal bleeding should become regular.