Help AF did not show

Tamika • I am a mother of 4 kids I work full time at a Nursing home taking care of elderly people as I am a Certified Nursing Assistant and just got done with college and now also have my phlebotomy license.
Hi I was due with AF on August 20th she is 6 days late on the 22nd I took a pregnancy test and it was negative did u test to soon? I never miss my period it comes at least once a month.