TMI but I need help

Baby L
Ok so I am almost 5 weeks, we think. I have taken the hcg blood test twice and the levels went up the second time. I have been spotting a brownish color for the last week but today I actually had a little more red and now it was a thicker yoke like substance that is brown?? I don't have an apt with my obgyn until Wednesday. Should I be concerned and has this happened to anybody else and it not end up in a miscarriage?