Thanks for writing to us with your health concern.
My thoughts are that you have experienced a chemical pregnancy
This is because urine pregnancy tests
are almost 97 % reliable in diagnosing a pregnancy.
If yours was positive, then you HAD mostly conceived.
However two negative blood HCG
tests conclusively rule out a pregnancy now.
The next step is logical -
please have a pelvic scan done transvaginally.
This will reveal if there are any telltale signs of a miscarriage
, such as retained products of conception ( they might require evacuation if you havent bled through ).
Please get a scan done ASAP.