I agree with Sherie, were both your tests the same brand and did you test at the same time?
I know this time round i got a little spotting before i tested, but b/c i 'felt' different i had in my head it was implantation bleed, which yes it happened to be, if you test to early you are not always guareenteed to get the right response.
Im hoping its implantation bleed for you. Test again in a couple of days if Af hasnt reared her ugly head.
Like Sherie said it could also be a chemical pg, but heres to hoping its implantation and you announce your bfp real soon