2nd time + moms

Help😔 I have a 4yr old daughter and currently pregnant with another girl due april 20th.. Idk if it's all the hormones or what but I'm struggling right now bc I cant imagine how in the world I'm going to love anything as much as my 4yr old..ik it sounds bad but it's how I'm feeling n I'm really upset about it. But she's my best friend we do everything together..we had to move bc my husband got promoted a couple years ago and I became a stay at home mom so I never really made friends here except my neighbor so my 4yr old became my bestie n idk how im going to share my attention with another kid without taking away from her and it's breaking my heart