Threatened Miscarriage

I'm 7 weeks 3 days pregnant. Started spotting yesterday and went to a local ER (I am out of town visiting my family). Was told that my cervix was still closed and there was nothing to worry about, but no ultrasound was done. Today experienced a episode of heavier bleeding with the passing of small clots which has stopped. I have had no cramping just slight lower back pain. Anyone else ever experienced and continued to have a normal pregnancy?