my bitch she is a bullmastiff is 64 days pregnant.ihave been taking her temperature all day it has stayed at 37.4 .she hasnt eaten today at all.but other than that seems to not be interested in having them soon.is there any other signs i should be looking for.?

Depending how many matings you have done the speam can stay in the chennel for a few days .If you only did the one mating dont let her go over severn days from the last mating.
Signs are go off food a few days befor, panting and scratching all things to look out for but if she look at ease dont worry too much