2 periods in 4 days!!!! WHAT??!!!

Soo..first off let me say that I knew this cycle was definitely going to different because I had severe cramping from ovulation to when my period started. So my period ended 4 days ago and all of sudden it started again yesterday, just a light flow but this has never happened before and honestly I'm scared and of course it's the weekend, so I can't call the Dr until Monday. Does anyone have any insight as to what's going on because I've never heard of this happening before????