Have you continued BDing Tarasue? As then you definitely could have just O'd late and it is implantation bleeding!! I know long cycles are a big pain but you can get pregnant from them. My first son was conceived on CD41! I agree with yogi- how is your cervix and your CM?
I'm still feeling a bit "off" but that could mean absolutely nothing! I'm waiting to see if any symptoms increase or become clearer before I think anything for sure...