Ok so I took plan b on October 21 not because like I wasn't safe I used a condom but the guy just asked me to so the twenty sixth I started bleeding and bleed for a whole week well my period was due November 7 and it came a week late which I know sometimes happens on plan b now I have had sex in between then and now but I always use protection but I'm not on birth control so what I'm asking is will my period this month come on a week late two bc I've already passed when it would've been on my old cycle or should I be worried that it's a little late from my old cycle I read that plan b can effect ur cycle for a long time just want input