Is leaving job good choice if you feel you are getting bullied & it's affecting your self-esteem?

I am overworked(60 hours per week sometimes). I am in this position for 2 years no body had any problems with me until new. I became pregnant & new person is hired. She is pointing out all minor mistakes(eq typos) which I would don't mind if it's limited between couple of co workers but it's been told to not only our boss but client also. I am told I am not good in communication/language because my mother tongue is not English. and it was not problem for last two years.