Confused

neha
I m very confused... i have irregular periods.. cycle of 40 days... and i got my last oeriod on july 17 .. still i dint got my period... but i took pregnancy test before 1 week it was negative.. but m feeling very tired and always feel like fainting from last 1 week... dont knw what to do... can someone help me to knw.. if i m pregnant or not..