Bleeding

So I will be 6 weeks on Thursday, and I started bleeding today :) it was a gush of brownish red blood, didn't fill a panty liner though. I have not had any cramping or clots. Not really bleeding since then. Hoping and praying everything is okay, it is my first pregnancy after only a few months of trying. I had my hcg levels checked last Thursday at exactly 5 weeks and they were normal at 1874, had them checked again this afternoon and I have to wait till tomorrow afternoon to get the results back! The wait is killing me! Has anyone else has this happen and everything turn out okay? What could this be? My mind is automatically going to the worse case and that's all I can think about right now!