HELP! Does plan b make you spot?

I’ve taken plan b lots of times before and I’ve never had spotting. I’ve had everything else but I’m so confused since I had unprotected sex but he pulled out on time and i took plan b probably less than 6 hrs after that. Today I felt like I was on my period for some reason and when I went to the bathroom I saw some light pink blood. I took plan b last Sunday and it’s only Friday. My period is in about 11 more days. Is this normal or is it implantation bleeding? 😩