Yes, it could still be too early to test. Give it until the time you are actually due to have your period and retest then. But, it does sound like it could be implantation bleeding! I wish you the best and hope it is a sticky bean. In the meantime I know this must be driving you crazy...try to have patience.
Deb
http://www.tubal-reversal.net/
I took a hpt and it was negative, was that too early to test
It sounds like it could be implantation bleeding. Best of luck to you!