I think I'm miscarrying

Hi ladies. Maybe someone who's had a miscarriage can help me. I took a clearblue pregnancy test yesterday morning because my period was 10 days late and got a +. Later that afternoon I started cramping really bad and bleeding. This morning I took another test, this time digital and got a not pregnant. My cramps and bleeding are heavier. I know clearblue is fairly reliable, especially at 10 days late. Did I miscarry? Or is it possibly something more serious such as ectopic?