5 1/2 weeks with brown spotting

I was just wondering if anyone has experienced brown spotting. I know that it is old blood, but mine also has some stringy like texture, no clots just string. This happened for about 1/2 day then stopped. I took another test last night just for peace of mind and it was clearly still positive. Today nothing has happened and everything is normal. I'm ok with the spotting, just the type of discharge worried me a little.