Pets acting different can know before i do

I have 2 cats and a puppy. I just notice my 2 cats have been wanting a lot of attention which is not normal for them. My puppy used to love being by my side 24/7 now she been acting different. She follows me around and only sleeps by me at bedtime. I miss her cuddling with me all day long.. Can they know I'm pregnant before I do.. I have a lot longer to wait before I can test.