Could it of been implantation cramping?
It could be. Implantation takes place 6-12 days past ovulation. So your chances are good. Um, a lot of women do not spot when implantation takes place. So dont get discouraged if you do not spot bleed at all. Take a test around a week after your missed period. Make sure you dont drink much fluids and hold your pee for at least 4 hours before taking a test..it will just help give you a better reading.