Cramps at 11 dpo?

Anisha
Hi all,
Is it okay to have implantation cramps at 11 dpo
And can anyone define how they feel like?
So today morning i woke up with mild cramps and thought for sure that my periods were coming. But they were really mild ones and lasted for like an hour on and off.. 
Now they are gone and i am not not bleedibg yet. Now feels like no sign of af.. So wierd cause usually the cramps go on for half a day non stop and i bleed within mins of such  cramping