Plan b, and early period? Please help:(

Hi this is my first time posting on here and i really need some advice or reassurance that I'm ok. So I had my period on the 11th of November and had unprotected sex with my boyfriend and I took the plan b pill on the 19th. On glow it said It was my first day ovulating, and then suddenly today I got my period. I was bleeding a lot. And I was scheduled to get my period on the 5 of December. I'm just concerned because my period came really early. And I've heard of people say if your ovulating it doesn't work and sometimes you just bleed for a day and it means nothing.