any advice on how to deal with anxiety?

Bárbara • I'm 29, and I have a beautiful baby girl born on May 30th, 2017 ^^ I also have a dog named Oliver and I love him lots!
I'm 21yo and 10 w 6d pregnant with my first baby, I feel extremely ansious I can't stop thinking about stuff like will my baby be healthy or how I'm I going to tell everyone, I don't know how to stop thinking so much, any advice?