i did not get a positive test with my second pregnancy til 7 days after AF was due. i tested negative all before the 7 days, so there is still hope:)
Its possible but you may not have ovulated until late.if this hapens your period is later,give it few more days and test again.
Yes, it's still possible that you are pregnant. Make an appointment with your doctor, and get your HCG level checked in a blood test...