Please do not take your bitch's temperature every couple of hours. She is pregnant, and she hardly knows you as it is. Take the temperature twice a day: 7AM and 7PM. Write it down.
Yes it goes down and comes up. It works it's way down to about 98 degrees. And it stays there for about 12 hours, so you don't miss it. It comes back up before the whelping. Usually, but if you are checking only every 12 hours, you may not see that, AND that is OK.
All bitches are different. Nesting may take place days or even a week before the babies come. And it could take place hours before. Three days before, she may be moving the papers around. And we go and get all excited and run in to see if anything is happening. Nope. She is just trying to get comfortable. Relax.
Some clear discharge is normal, it could be the plug.
Usually the signs that whelping is imminent:
a drop of temperature of at least a degree withing 12-24 hours before whelping.
a lot of water -- that may arrive with 30 minutes of a puppy.
Circling and licking at her parts, and bearing down -- if she has been bearing down for 2 hours, and still no puppy. Get her to a vet.
Lots of heavy panting, and lying with visible contractions.
Frantic ripping and tearing at newspapers (while circling in the box).
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.