When is too soon to test?

My husband and I are TTC. It's a very slim chance this will happen naturally as he had testicular cancer and chemo wipes out sperm count. He has a VERY low count. With that said, the past couple of days I have been nauseous with no explanation and am wondering when is too soon to test? I am 6 days til AF. Is it too soon to test? Thanks ladies?  

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