5 weeka ago I though I was miscarrying... Now... Please read and help!

When I was 10 weeks pregnant I started bleeding really bad. Like a period bad. Bright red blood. I rushed to the E.R. with panic. I just knew that I had lost my baby. They did an ultrasound and told me I had a Subchorionic hemorrhage. They explained what it was and told me to just rest and stay off my feet until the bleeding went away. So I did just that. The next day I had stopped bleeding completely and went on with my normal life. Two weeks later I was using the restroom and went to wipe and there was a huge amount of brown blood. I need heavily for about an hour and then spotted for a day. I didnt go to the E.R. because from what I researched is was just old blood. I had a ultrasound at 14 weeks (last week) and we have a healthy baby boy. But today I started bleeding dark brown again and I slightly cramping... Can anyone explain why I keep bleeding brown? Is it normal? Please ask any questions if needed. Thanks in advance!