I took a plan b, really long period

I took a plan b on a Monday, two weeks ago. That weekend on Sunday after taking it, I started spotting which is normal and bc I’ve noticed that I got a light to medium period when I take it which isn’t often but I remember. And now its Monday two weeks later and have had a long light period for a whole week now, it comes and goes? Like its not an alarming amount at all! But it’s just like spotting that hasn’t gone away? Is it the plan b messing with my body?