the same thing happened to my mum with me for 3 months!! she kept telling the doc that she was and the tests kept coming out neg. Also happened to my friend, I have been told that a neg can be wrong but a pos is right. Good luck with things and let us know.

While i was trying to get preg. with my son, this happen to me.  I had all the signs I also took the home preg. tests even went to the doctor all neg.  So finally took blood test it was not neg. nor post. so my doctor had me take another one still no anwser.  We waited 3 days and another and I was preg.  My hgc was just not high enough.  But for the blood test it was not low enough to be neg. either.  So dont give up tests can be wrong.  My doctor said a test that is neg. could be wrong, but a test that is post. is always right.  Hope this helps.