Light pink spotting 2 weeks after plan b. i am supposed to be getting period in one week. is it implantation bleeding or a side effect of plan b?

Can't tell: Plan B works most of the time, if taken soon after sex. When a woman does her home urine pregnancy test 3 weeks after using Plan B, she can tell whether her spotting was "implantation bleeding" or not. Always do a pregnancy test 3 weeks after Plan B. If the test result is negative, it was not "implantation bleeding". If the test is positive, then it was "implantation bleeding".