Does my niece know something?

Today my niece was supposed to spend sometime hanging out with her grandmama (my MiL)z Hubby and I decided to tag along as we don’t see her often enough. This is the first time I’ve seen her since we starting TTC. She only wanted me. She pulled away from my MiL and wanted nothing to do with my husband. She’s normally obsessed with my hubby. She sat with me, snuggled on me, talked and didn’t want to be put down. Hubs and I joked she may know something. Anyone have any experiences like this? Were you pregnant?