Is it normal to bleed after sex?

Patient: I’ve taken plan b about 3 times in the past 2 weeks. The last time I took it was about a week ago, I didn’t get any of the side effects that it brings but now (a week later) after having intercourse with my boyfriend I’m bleeding. It’s not heavy but it’s also not that light either. I’m supposed to be getting my period by the end of this week. Is this bleeding my period? Should I be concerned?