Hi, My cycle is irregular, my last period on May 19th 2009, on June 18th I use a First Response Test and it was a Faint Positive result, so I went to my doctor next day and the blood test came with 18 hcgm my doc told me it was low and to come back next week, it is now 3 days since my blood test, and 5 days before the next doctor appointment and I got brown discharge, could I be pregnant? or did I have an early miscarriage? or was it a false positive? or is it my period? Notes: I've being having the cramp sensation as when I am getting my period. My cycle varies from 23 days - 35 days but the past 5 period cycles where lower than 29 days cycle, just a 33 day on past November 2008.