I missed my period and i am now 5 days late but when i took a clear blue pregnancy test it was negative what does this mean ?

Tests are accurate: In a woman with regular periods, some causes of a late period include: excessive weight loss or gain, increased exercising, emotional stress, having an illness, traveling, medicines (such as hormone pills), hormonal imbalances, being near menopause, etc… Seeing or calling her doctor is a good idea if symptoms are persistent or worrisome. Home urine tests are very accurate by 3 weeks after sex.