Well I assume she is definitely pregnant, and her labour is close, for you to ask could it be that?
What colour is the slime? I do believe there is some peculiar discharge just before giving birth.
One sign of labour beginning is a sudden drop in temperature, so that may be one of the reasons she is shivering. Of course, pains cause dogs to shiver too.
Dogs are pregnant for about 63 days, though obviously it can vary a little, a day or so each side of that. So if that much time has passed since she mated, I think you can probably say it is her time to give birth.
Usually the birth will go without complications, but do be prepared for any problems, because they CAN happen. Have the vet's number and emergency out-of-hours number on speed dial, just to be on the safe side. If she strains without producing a pup for an hour or more, she needs the vet.
If I were you I'd google-search "dogs, giving birth", or "dogs, pregnancy and labour" and you will get some helpful advice to refer to as the birth proceeds, I'm sure.
I've never been there at the birth of pups (wish I had!) so that's all I can say to help you right now. Good luck! Hope all goes OK, and there are some lovely little puppies soon, and a happy Momma!
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.