Pregnant and did not know it???

Has anybody ever been pregnant on here and did not know it ?? I've took it in a pregnancy test and they keep coming back negative my last normal. Was June 23rd the rest has been spotting brown discharge it did that for like 2 weeks and then I've had two days of very light bleeding and that's all I've had since June I've had no bleeding lately tonight me and my husband got into an argument and I could feel something moving below my belly button in that area.. I've taken pregnancy test that's pregnancy test and keep saying no but this is not the first time I felt something move what does everybody else think

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