Clingy kitten

Yesterday I got a new kitten but I had to leave her at my sisters for the night. When she was at my sister’s she went exploring the house and was playing but today I brought her home and all she wants to do is be on top of me. If I get up she tries as hard as she can to stay on top of me or she will follow me wherever I go. Could it be because I’m pregnant? Or is it probably something else?