Misbehaving Doggo

Our chocolate lab is usually an angel. She’s five and she’s always been so easy going and well behaved. Lately, she isn’t quite herself. She is leaving our property and not listening very well. My only guess is it has to do with me being pregnant. Anyone else’s dog change their behaviour since they’ve been expecting? I worry how she will be when the little one arrives. She’s been our whole world since we got her and I hate to think she’s going to struggle with this change 🙁