Disney I know exactly how you feel..
I keep wondering the same thing.. Am I going around feeling and believing I'm pregnant when in reality my little emby has stopped growing ages ago..
But, I believe that he is still there and go strong.. So much so I bought a 0000 Mambo onsie from Big W yesterday that says "waiting for the milk to come in"
I had my 3dt on 2/02 and my blood test is the 15th so I think your test on the 17th is normal.. but I think it all depends on the clinic
My cramping has stopped (it was quite sore yesterday) and today I am getting twinges every now and then so praying that emby has found a safe and warm home..