Hello everyone! At 7 am I started feeling my stomach pull like during …

Hello everyone! At 7 am I started feeling my stomach pull like during my period. All this time I endured, thinking it was training contractions. At 9:30 I went to the bathroom and started bleeding slightly. I drove to the hospital, they examined me and said there's no opening, and sent me home. My stomach still pulls every 20 minutes or so.