The month before we conceived DD, my periods were late, so I went to the dr. She did a test and the line showed up straight away, and as we were looking at it, the line disappeared before our eyes. I had a BT which was neg. Not sure what the levels were but she said it may have been a blighted ovum (a sac but no baby).

Anyway, maybe the test was faulty in that the line was in a different spot to usual....

Best of Luck with the BT. Do come in here and let us know how you go with it