My Dog Is 66 Days Pregnant And No Signs Of Labor Yet. Is It Okay?

Up to 68 days is normal but if you see signs of labor (not eating, drop in temp, restless, pains) take her in asap.  I'd take her into the vet for an x-ray to make sure something isn't wrong on or before 68 days just to be safe.  Take her temp and see if it's over 99.  If it's over 102 could be infection, 100 she's just not ready, 99 she should have them within 24 hours or go in for c-section.
Sovrana Cane Corso

Depends on the type of dog..chihuahuas are pregnant for only 58-63 days......not 68 .I hope you got her to the vet to be checked.And a pregnancy xray is ALWAYS a good idea so you know she hasn't retained a puppy when she does give birth.

Yes  she  should be  due  any day  now , if  she starts  heavy breathing  with  gagging  she is going  in  labor