I'm 16days late today my lasted lmp wasjuly 62012 I have a tt day cycle I have taken 6test since the 83hof aug all negative so far but no period could I be pregnant and not have high hcg levels??

Possibly. But it could be due to a number of other things: stress, medication, excessive weight loss or gain... also your age. Many woman begin having longer stretches between their periods as they get older. If you are negative on a pregnancy test and still want to make sure, you can get a blood test from your doctor. Otherwise, keep a calendar of your cycles and see if they just have increased in length. Talking to a doctor is always a good idea.