hometime and the 14 hour rule

My question is it ok to log off duty and continue to drive past your 14 hour clock when your relieved of all duties without a trailer in bobtail status and enroute to your home.
Today I did not drive over my 11 but I did drive over the 14 hour clock as off duty on the off duty line, to go home. I'm an OTR Driver, been out for about three weeks, I had scheduled time off which was set up to deliver my last load to a drop yard then go home.
My home was about 90 miles from the drop, after I completed the drop I posted a post trip off duty status then drove home with a flag showing personal use for the off duty status, about 1 1/2 half hour over my 14 but in off duty status. flagged personal use...
Is this legal ???