Plan b effect??

Alanis

So I had sex with my husband june 1st June 2nd I got the plan b June 3rd I had a really bad car accident. I had my period from may 26-31st. After that I got my “period” again June 6-12. It was no time for my period and it was not as my regular period is. Is it a pill effect or it might be from the accident?