Help!?

Hi I'm a second time mom early pregnancy. And I found out due to how my almost 2 year old daughter was acting and she has been having attachment issues like always wants to be be with me dont get me wrong but I cant even walk to the living room to the fridge without her panicking and hyperventilating anyone have advice on how to handle it? Is this due to her knowing there is changes happening and she feels like I'm replacing her. Cause she will always be my baby girl and my best friends I just need help.