Pregancy test dilemma

Patient : Can donating plasma on a regular basis lead to a negative blood pregnancy test result. From my research, I have discovered that Hcg is extracted from plasma/serum in the blood. I donated plasma 24 hours or less prior to the time of the pregnancy test blood draw. Could this throw off the result?
Symptoms:  Two urine hpt. Both negative two weeks after lmp. Negative blood test 6 weeks after lmp. Still waiting on menstrual cycle and somehow "feel" pregnant.
Doctor :   This question is currently in queue and will be answered shortly by one of our doctors. In the meantime you may browse our library of answered questions by clicking here.

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