When is it too soon to accurately test for pregnancy??

I thought I broke my heel and decided to go into the doctors to get checked out. Since I'm ttc, they took a pregnancy test before taking me into x-rays. I'm only 5dpo. Test turned out negative. So my question is, of course, could it be too soon for even a doctor to REALLY know unless my period doesn't come? Or am I just crazy lol 🙃🙃

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