I'm worried because she normally is very attached to me , but now all she really does is walk back and forth as if she is checking up on me
Dogs are very smart. He may know something you don't and you may see your little one soon. I have a 50 pd pit bull who loved climbing up into my lap at night and when I found out I was pregnant she wasn't doing it. She would walk over and put her head on my lap and touch my stomach with her nose. To this day she won't climb on me and if I call her up to me she will only put her front feet on me and lay on me lol. She knows.
Dogs are very sensitive to pregnancy and at times they can sometimes go through the pregnancy motions too. Keep an eye on the dog and make sure that they are not ill. Chances are that you are due anytime soon and your dog has picked up on it.
Maybe your dog isn't feeling well.