Yesterday my period started I saw my pad after few hours there was black and dark brown discharge and it stinks very bad  in very less area on my pad I thought it is starting of my period and it is normal because blood flow is very less but it is happening with me for the first time, today is 3rd day of my period and the condition of my pad is still same no blood just dark brown discharge.  I am also not having any cramps no pain at all . I don't know what exactly it is why it is happening