7 days late...bfn at 5 days late...could I still be pregnant?

I was supposed to get AF October 10 and it is no where in sight and I am NEVER late.

I have had many symptoms:

Backache just started today, Little bit of naseua, Headaches, Cramps, mood swings, acne, bloating, constipation, and extreme fatigue. No soreness of breasts though.

I tested at 5 days late and got a bfn. How long should I wait to test again?

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