Period question

Okay so, I had sex during my fertile window near ovulation, and the condom broke so I was stuck taking a plan b, bc ejaculation happened. And I got my period at normal time frame but it only lasted for one day? Could that be from the pill? I’ve never taken a plan b and my period only last one day, it’s only ever been late or on time, or early and it was still a normal 4 day cycle.