Aww hun, I was really hoping it would be a bfp for you. It does seem a little weird. As Kelly said if you have had any major changes in your life it could be that? Or it could have been late and the stress of thinkinwhat's going on could be keeping it at bay? did you explain to the doc you saw today that you had a very faint positive originally? I would go back and see him again, or try and make an appointment to see the original doc you saw. I suppose it is possible you have had a mmc and that is why you haven't had
AF, although i would have thought this may have showed up on blood test? So sorry hun, i hope you can find out what is going on soon

Xx