Late Period, on Birth Control

Hi!  I am on birth control but had a pretty stressful month with the start of school and my house being broken into.  I am very aware that the stress could be a huge factor in this, but I have not felt stressed in about 2 weeks.  

On approx. Sept. 11 I started to have some dark brown spotting it wasn't a lot so I wouldn't consider it my period.  It lasted about 4 days and then stopped.  I was supposed to get my period this past Sunday  (Sept. 21) but it hasn't come yet.  I have never missed a period and have always started on the Sunday I start the inactive pills.  I have taken 2 pregnancy tests that came back negative and talked to the nurses at my doctors office.  I received to different responses from the nurses, and am looking for some more thoughts.  Could I be pregnant?

[alaysha]

Stress surprisingly can do a lot to the body. If you were stressed that could cause you to ovulate late which in turn would make your period late as well. Even though you haven't been stressed in 2 weeks it still has an effect. I would wait maybe another week do a test if your period doesn't come and if still negative then contact your doctor and request a blood test.

[torp527]

I had dark brown spotting about 10 days before my period that lasted about 4 days.  Pregnancy tests are still negative and I still haven't started my period (7days)  The doctor believes that the dark spotting could have been my period.  Thank you for the post!