advice 4 weeks but brown discharge

Sarah

Yesterday I got a bfp later in the day the brown discharge started. I have had brown discharge from my 3 previous pregnancy at 5 to 6 weeks which all lead to miscarriages. I am only 4 weeks this time. my consultant advises to take progesterone and heparin as soon as I get pregnant from results from my previous miscarriages. I just keep thinking I am miscarrying now so what good will those drug be? any support is appreciated.