AF late

I am now going on to being 4 days late. AF always comes on time ever since I first got it 10 years ago. I haven't been under a lot of stress lately like I have been in the past so I know that stress can not be causing it. Me and my husband have been TTC for about 6 months now. I took a test on 9/17 and it was a BFN. Could there still be a chance that I could be pregnant?

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