76 days late . opinions needed.

i’m 76 days late on my period . Ive taken multiple pregnancy test, doctor visits etc.. everything coming back negative. 3 days ago i started spotting and it’s still happening, It’s Very light. i took a pregnancy test again(the first day i started spotting) and it still came back Negative. Doctors aren’t telling me anything 🙄 do anyone have an idea or have had this happen before ?