Talk to your baby!!! Really helped me!! Try to keep busy. Take a prenatal yoga class..that helped me a lot...plus i got to meet other mommys there.
Try finding some friends who are a good support and spend as much time as possible with them. Try having activities that keep your mind busy, like reading, decorating the babys room... and keep smiling, your mind will think you are happy and it will make you feel a bit happier.