⚠️HELP ASAP⚠️

I finished my period in October 19th and had sex on the 21st and I took plan b the next day which is the 22nd ofc, and I just got my period Today which is a week later from my last period, and I've been getting bad headaches. I googled it and the first thing that said was pregnancy. I know I'm supposed to take a pregnancy test 2 weeks later after taking plan b but I just need reviews of anybody who used plan b PLEASE HELP :(