Took plan b 8 days ago ovulation signs 5-6 days ago unprotected sex after plan b multiple days spotting today and yesterday could it be implantation?

Can't tell: Taking Plan B can alter the timing of the current cycle and the upcoming cycle. One should check a urine pregnancy 3 weeks after taking Plan B. Only after a positive pregnancy test can a person look back and say, "That spotting must have been implantation spotting." One need not think about "implantation bleeding" before there is confirmation of a pregnancy.