When to test

So AF was due today, no show, no signs of it. I have been extremely nauseous since yesterday and tired. My problem is I had a chemical pregnancy( same time af was due) and this should be first AF afterwards. We were TTC this month and I feel the same way as when I had my positive with the chemical. Is my period just out of whack now or possible pregnancy? Confused please help. When would I consider AF late and test?

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