Mid cycle bleeding part 2. Treatment?

I was in ovulation induction treatment for last 3 months. I was taking Letrozole (from day 3 to 7) and Duphaston (From day 14 to 28). My last cycle period date had come on 25th April. And then after 25th April, I stopped the treatment. And just after 14 days of stopping treatment, again I got bleeding for 2 days. What could be the reason of the bleeding? I don't have any history of irregular period. Then why this mid cycle bleeding suddenly happened after stopping treatment? And now upon checking with my gynaecologist regarding this bleeding issue, she advised to take again Duphaston from day 16 to day 25. She said as we are trying to conceive we have to take Duphaston. My concern shall I continue taking Duphaston or stop it? Because if I take duphaston, everything will be normal. And again issue might come after stopping it. In this way how my cycle will be normal naturally ? So please share your suggestions. Shall I continue taking duphaston for 3 months as prescribed by my doctor?