Been spotting for over a month. Used vitex.

So I started taking vitex a pill to induce periods and help you get pregnant. Well i started spotting for a week and thought it was normal and my body was just adjusting to it. Then I got my period which was heavy and lasted 2 weeks then it started getting lighter and now it's been about 3 weeks after my heavy period and I'm still spotting. It's light brown and sometimes pink and very little. I can go a whole day with a light tampon in and it's still not even half full. What's wrong? Is my body just getting all the vitex out? I don't think I'll be using vitex again anytime soon.