I have donw a pregnancy test and I'm not pregnant, but my period this month is late, I'm on the pill and on placebo pilld last week and have not gotten my period. I have been very exhusted lately, feeling ill here and there but I'm very busy and have high stress and anxiety. Last month my period was 9 days late and then only lasted 2 days and was likt the end of a period. Do you no what it may be?