What is going on ??? I took PLAN B and now...

Hello ladies.... I had sex with my husband 02/08 the condom broke so the next day 02/09 I took plan b. Yesterday 02/13 I had wax again he finished outside and today I started cramping and when I went to the bathroom and wiped there was pink blood on the toilet paper.... my question is, I’m I getting my period early or is the plan b working late ? This is my first time taking plan b and my first month being so immature about this situation. I have always taken responsibility but this month I don’t know what happen to me. Please any advice is welcome.