Don't feel the love or anything for my future baby

I've recently found out I'm pregnant and I don't feel anything, I'm a little sacred but it doesn't feel too real and I've realized that I don't feel any connection or love towards the child in my body. I'm only 4 weeks but we have been TTC for over a year. Is this normal? Will I start feeling differently when I'm further along or once I hear the heartbeat?