I don't know what I should do....

I'm on day 37 out of a 34/35 day cycle.
I could a pregnancy test on day 33 (the day before AF) in the afternoon, which was a BFN.
I've got no symptoms, except the hot flush here and there.
Do you think I could be pregnant even know the negative test?
Or is it something else?
I'm so confused, please help.
Thank you 

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