Weird!

My little niece who is 1 1/2 Is being so clingy since Saturday. She does not want to go with anyone or leave my side. if I sit her down next to me she cries till I carry her. She also keeps laying her head on my stomach and cries when someone touches her or even tries to get her. She would not leave my side which is not usual of her. She was never this clingy to me. I'm 2 days late for af hopefully this is a sign. I am so tired and she won't leave my side with anyone. Anyone's kid or family member kids do this and you turned out being pregnant?