Ovulation twice in one month? Maca & Vitex

Is it possible to ovulate twice in one month? I just ovulated around 1 1/2 weeks ago, and I started taking Maca Root & Vitex to try to help regulate my cycles (I have very irregular cycles) and I also use the clear blue digital ovulation kits. It has said low fertility the last  week after I ovulated (we were not able to BD at that time btw)....But this morning it says I am "high" fertility again....so I don't know if that is normal? And should I actually follow it/believe what it is telling me? Or is it more having to do with the new Herbs I am now taking?  Thanks :)