Silver, when you tested today, did you use first morning urine and was it the same brand of test? at the early stage of pg, some tests jsut can't pick up enough HcG to register a +ve result. So it is possible that has happened to you. Or the other possibility is that you have had a chemical pg where you get a BFP but then go on to have a normal AF, kwim?

I hope that you have just tested too early to get a definate result