On the day before my period was due, this month I had brown odorless discharge, on period due date the discharge stopped and I did not have a flow as normal. 14 days later the brown discharge began again. All pregnancy tests have been negative including a urine test taken in a family planning clinic where I also tested negative for HIV/AIDS and all other STDs or STIs. I have had symptoms consistant with early pregnancy and the discharge is odorless. Is it likely that a blood test at this point would reveal that I am pregnant even though all urine tests have said negative? And if not, what could be going on? This is my first time ever of having brown discharge at any time other than on the last day of my normal monthly flows.