I need advices!!!!

So a week ago I found out I was pregnant and even posted a picture here  when I did. I been really sick and I was out a few days from my job but always turn a doctor note at my job. I was about to tell them the I m expecting and before I did they fired me Just   like that....I work for a salon and it's a big company who are based on all numbers. They told me I didn't meet the my  number but I m above two of my co workers and they got aprobation! They had two pregnant coworkers in the past and I feel they did it because they don't want to deal with one more. I m not stressing over a job because God always provides but I wonder...what law could protect me in this case? Or I can just get unemployment??! Any advice?! Thank you