Unsure if pregnant

me and my fiancé have been ttc for a few years and my normal cycles are from 28 days all the way to 34 days being the longesr it has ever been. This cycle I am at day 41 and I have taken 3 tests so far and all came back negative. I am feeling really tired all the time, nauseous a lot, back pains, and headaches could i be pregnant or do u think stress could It really be something else 

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