I see the progression, laughingduck. I had lines that were like that for a few days too, looked as if they were getting darker but very slowly. I also used opks in addition to hpts to track pregnancy and the opks were stark white negative. Literally overnight I must have gotten a spurt of hormones because my hpt line suddenly became a blazing positive and my opk went to a full blown positive too! Hopefully you find out good news at the doctors tomorrow! Fx