Bleeding on ovulation day?

So the day before my firtle days I had sex and took plan B within a few hours. Now I’m on ovulation day and I’m bleeding, not to heavy but it’s like a regular light period. Iv taken plan b before and it’s never changed my cycle or feat gave me any symptoms that I noticed or spotted or anything. But not sure if this is a side effect of the plan b? Or if it induced my period to start really early? Has anyone else has this happen? I wouldn’t really call it spotting Becuase there’s enough blood to be like a period.