I took an at home test and got a positive on 1/16 &1/17. I knew i was pregnant prior to the test because I experienced implantation bleeding on 12/7. I experienced severe cramps, clotting, and starting light on 1/21 in the evening. it continued to get worse and i went to the doctor 1/22. My hcg levels were already low and "undetectable" Im still trying to wrap my head around this. Is it because I passed the embryo

prior to the testing?