I'd just hold off till the next cycle but you can do the last 4 weeks 8-11 and then start pct. don't wait 2 weeks after last shot to do pct, that's too long. You want to get your body to start recovering earlier.
I am not to big a fan of dbol at the end of a cycle. Mentally its bad for pct. Going into pct coming off the dbol you will be dropping weight like crazy. So be ready for that.