Three invalid pregnancy test could I be pregnant?

Patient : I am two weeks late on my period and have had a normal period for a while now, I get it on the same date every month. Except for this month and last months. Last months my period lasted only a day (not the usual 3-4 days), and was 8 days late. Now I don't have a period at all. I have taken 4 pregnancy test all different brands and 3 of them came up invalid and one negative. I made sure to pee in a cup and dip the test, and take them all in the morning time. I've been having weird cramps in my lower abdomen as well. Is it possible that I still could be pregnant? I can't explain it, something just feels off.
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