There have been any times I have believe or WANTED TO BELIEVE SO BAD that we were finally pregnant after our loss and regardless of what the tests said I believed I was infact pregnant untill I had a sonogram revealing an empty uterus no pregnancy no baby no heart beat an empty tummy!!!!
Altho Some women can show - on a hpt and even some blood work very uncommon but have heard of it... apparently some women go 9 months not knowing that they were even pregnant. So I am sure if our body can convince a women she is not pregnant I am sure it can trick us to believe we are when infact we are not.
If you are unhappy with the results you have received from you Dr. then I suggest seeking a second opinion and maybe requesting a sonogram/ultrasound just so you can see for yourself there is no baby growing inside of you..
Hope this help GOOD LUCK