Hi, I've Been Prescribed Duphaston To Try Regulate My Cycle.

Hi, I've been prescribed duphaston to try regulate my cycle. I am trying to get pregnant and following a miscarriage, I was bleeding several times a month. I took 1 pill from the 12th -24th day of my cycle. A few days after I stopped I only had some very light spotting when I wiped for two days but no period. I stopped the tablet 12 days ago. I took a pregnancy test but it was negative. Do I count the spotting as my period and start the tablets again after 12 days or do I wait until a proper period comes ?