When is my dog going to go into labor?

I have a 8 month old husky, german shep. Mix. She's healthy, and has had all of her shots...... about 2 months ago, she got out of the house and went missing, animal controll got her, when I picked her up, they said they c,ouldnt fix her bc they thought she was pregnant. She also was fooling around with a nother dog, (a roomate brought to my house without permission) they were supposto keep him outside and away from my dog, incase she wasn't pregnant after all, (I didn't want to take chances). My room mates told me they brang the dog in the house multipul times when I was gone to work, and the dogs...... "got together" so I don't know if this got her pregnant, or she was pregnant befor she got picked up by animal controll. But she's HUGE now, eats more and more every day. I can see the puppies moving in her stomach, and she has been sleeping a lot in my clothset, which is where I think she is going to have them... so I made her a bed for her to have them there. I checked her a week ago to see if she was milking, and she wasn't... now she is.. I need some advice, on how to see when she's going to go into labor, I want to be here when she does... I heard something on here about checking her temp, and when it gets under 99 or something she will go into labor in the next 12 hours... how do I check it?? Iv never had a pregnant animal befor, so I don't have any idea what to do! No smart answers please, thank u for reading all this