pregnant and a new job

Has anyone ever looked or found a new job while pregnant. My son is having surgery (getting his tonsils adenoids and tubes in his ears) on Friday and my boss was supposed to give me Friday sat and Sunday off, he told me he would, but he called again and asked me a few days later what days did I need off. Not thinking that he wasn't considering the days we talked about I told him I had to go to court on Tuesday and would need that day off as well. Come to find out he didn't give me the three days off around my sons surgery and told me it was because we're having a big sale on Saturday and inventory on Sunday and needed me in store. Point is now with all this mix up I am so upset and feel like maybe I should look for a different job. What do you think?