I was about 4 days late. It was a predictor test.
I got a BFP the first time I tested, I wasn't actually trying and only took the test because I'd just got back off holiday and when unpacking found my unused Tampax and thought "Oh yeah I was supposed to be having a period last week". I didn't expect a positive, I was just testing because I thought a negative test would stop me worrying - Opps. lol. What a happy accident that turned out to be.
Keep trying honey. If it goes on to two weeks, book an appointment with the Doctor, there may be an other reason for the missed period or maybe you just have low HCG levels and he/she can try a blood test.