My dog is pregnant,her temp is 99.8.?

how can i tell if she is having a false prenancy or real? her temp is 99.8,it feels like there is movement,but im not sure,he are swelling an filling with milk. she is digging at her bed,bleanket,couch,etc. what are signs she really is going into labor,an it isnt a false prenancy. but her temp is dropping steadily today from when i took it,it was 100.0 when i first took it,now its 99.8. is that a good siign