Still having brown spotting !

Hi Ladies,

So my first prenatal appointment was 8/21/2019 I mention to the doc that I was experiencing brown spotting. She states that it’s old blood and everything looked great !!This started on 8/14/2019 and is still present. I am 10 weeks and very concern . I went to the ER this Sunday for lower back pain and spotting. All labs results were good and baby arms, legs where moving . The baby heart rate was strong . I am so concern because why is this taking so long to go away ?