halo, my period came short this month for only 2 1/2 days,but it was a brown discharge and sometimes pink-reddish. my period usually last 4-6 days. on top of that,i have been having mild lower back ache a few weeks before my period and until now. occasional shooting pain in my breasts but not tender. my stomach feels full all day and i feel uncomfortable in my stomach when i try to sleep facing down. i went to the free pregnancy clinic before my period came and the test was negative. now am confused because i don t know what else might cause all these symptoms. please help me clarify this.