Has anyone start spotting brownish 2 days before period starts....took 2 pregnancy test came out…

Has anyone start spotting brownish 2 days before period starts....took 2 pregnancy test came out negative and the doctor thinks i miscarriage because for 2 months i been spotting during late period and started bleeding thinking its my period...i been eating alot breast gets tender on and off been feeling nausea craving food having headaches i told the doctor that cancer runs in the family and he said he thinks its a miscarriage and wants me to wait till next month to go back in and having brownish concerns me alot because i havent done this before im regular ever since i had my daughter.....so can yall help me by giving me advice or tell me what yall experience pregnancy or miscarriage....i dont want to assume im pregnant or have a miscarriage......i keep thinking its something else...family member says my pregnancy test comes out negative because of how are im making sure i dont keep my hopes up and she thinks i should get a blood work