Confused about my dog and labor?

my male and female dog locked-up 56 days ago that was the first time i seen. i haven't seen any drainage or leakage but i haven't been home all day either. she has been cleaning herself off and on. right now she is laying down in her bed which is a big square on the bottom of our entertainment center with a blanket in it. i didn't know about the temp. thing until tonight i took it at 7:56 and it was 99.1 i took it again at 9:20 and it was 97.9. she is not panting, or pacing, or anything else like that. she still wants to eat most son got some pizza and she came out to check out the smell as usual. not sure if she is in pre-labor or what but i don't wanna leave tomorrow if she is any advice is welcome and yes we have a vet. oh the 56 days ago was on the 18 of october but we penned them up together on the 16 so it could go 2 days either way