One sided cramps 9dpo?

Carrie
I ovulated early this cycle (cd11) and had my normal ovulation cramps then.. now I'm 9dpo and am having pulsating/ pinching cramping only on my right side possibly lower than normal ovulation cramps.?
We missed ovulation because it came early,  (BD on cd12&13 though) so I don't think I'm pregnant? 
Any thoughts? What else could it be other than implantation?