Can you get a negative result but still be pregnant when you’re supposed to be 3 weeks and 5 days pregnant?

I got negative results on a pregnancy test but I’m pretty sure I’m pregnant because of the insane nausea I have been having. This is my 4th pregnancy and it feels exactly how it did with all of my past pregnancies. I’m supposed to be 3 weeks and 5 days. My question is can you get a negative result but still be pregnant at 3 weeks and 5 days?

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