Fired for being pregnant...

Today is January 5th and today I was fired for being pregnant. In October we lost our baby at 5 weeks through a miscarriage. In November I found out I was pregnant again. On November 22nd I started a new job. I did not let them know I was pregnant because I just had a miscarriage and didn't know if it would stick. December 29th, I found out that the baby was 12 weeks and I was safe. I let my boss know I was pregnant January 2nd. He seemed happy for me and congratulated me. Today I came to work and he told me he was going to let me go because I didn't let him know before I was hired that I was pregnant. I'm unsure of what to do. I haven't been at this job very long.  Advice anyone??" Also I work for an optometrist and me being pregnant did not effect my job. I'm a receptionist.