Dydrogesterone

After taking dydrogesterone how long does it take for the spotting/ bleeding to stop? Doctor advice me to take for 2 weeks to support my pregnancy plus stop the spotting... back in Oct'22 I had a miscarriage. yesterday I did 1st abdominal & vaginal scan, can only see sac. Docotor mention base on scan, I'm only 4 weeks pregnant. Need to go back in 2 weeks time for another scan... still having brown discharge. Feeling very worried #firsttimemom #advicepls