Good Afternoon! I Am Married With 2 Kids. Its Been

Good afternoon! i am married with 2 kids. its been 7 years since i used to take birth control pills. for the past months i am using daphne because it made my blood flow heavily. then just this month i switch to marvelone pills. i supposed to have my period on the 15th but until now i dont have. i am afraid im pregnant. i already took two pregnancy test and its all negative..what shall i do to have my period? i am experiencing blood spotting right now. please help...