Period confusion

The question is from my wife The problem started since few days.on October 7or 8 or 9 my period ended. On 19 of October bleeding started very little amount of continuously sometime brown and sometimes it's black so I didn't considered it as period I continued my Salah .on 24 October the red colour started and I stopped praying as it is period.on 29,30,31 I did prayed because bleeding stopped after 2 days I got same prb.and last 10 November I did start praying but today the same prb started. What should I do. Please help