Help Plan b bleeding

Before I start if you’re going to say get on birth control or why would you take it on your period don’t bother I’m looking for an answer not your criticism. I was on the final day of my period, bf came inside and immediately took a plan be because yes you can still get pregnant while On your period. So my period was gone then like 3 days later started bleeding like if I was on my period. I didn’t see the pamphlet that came with it because he just brought me the pill. Has anyone experienced that or know about it. I would appreciate anything that helps.