6weeks 5 days, spotting and only tired!

Hi, I had some pinkish red spotting last night only when I wiped, and then I started going brownish and is now very little brown when I wipe. No cramps or soreness anywhere. I also haven't had any pregnancy symptoms, other than tired, and a bit of heartburn. My hcg levels last were around 8600. And increased from the previous test at about 4/5 weeks of 500. Is there a concern? I only see my dr in 5 weeks time?