Hello, I haven't had a period since august 12, 2012 its now october 19, 2012. I took one home pregnancy test which was neg. I went to the clinic on?

Recheck a HPT. Pregnancy is only one cause of missing period. Also, home pregnancy tests are good, but not perfect and so getting a blood test maybe needed. Other causes: thyroid diseases, infections, significant illness or rapid wt loss/gain, excessive/prolonged exercises, and ovarian or pituitary failures are few examples of causes to miss your period. I would suggest consulting doc. Good luck.