I experienced some brown discharge and then nothing - no flow, just spotting. I was already 5-6 days late on my period. Checked for pregnancy on a urine test, and a blood test. Urine test showed a single line and the blood test showed <2.3 HCG. From the day after this spotting incident, I did start experiencing increased flow - enough to fill a pad. But it was all dark brown discharge. Even now on my second day (technically) of periods the blood is still fairly brown - very different from my usual bright red. Plus, this time I had no tenderness in the breasts or abdominal cramps which is usually always the case. Is there something to be worried about?