I had my period on 3/10/2011, wasn't quite normal but still had cramping and clotting. 1 1/2 weeks later I had some dark brown spotting for about 4 days, nausea, and now my breasts are super tender, I was in tears last night they hurt so bad. I took a HPT on 3/24 and again today, both were negative. Any ideas on what could be causing the severe breast pain?