Could Brown Discharge During Duphaston Treatment Indicate Pregnancy Or Is It Just My Period Starting?

Im married n tryng to cncve since 2018 i hve 2 misscarrige history with ovulation inductn treatmnt my cycle r irregular so im on duphaston 3times a day for 21 dayz to regular my cycle but this is my 12th day of duphaston but issue is im havng brown discharge not on panty but on using water im pregnant or what or iss that period?