Accepting a Job While Pregnant

So I'm currently 30 weeks pregnant and recently got a new job just working at a grocery store. I don't work with any chemicals or anything else that would cause harm to the pregnancy. But I'm not sure if I should wait til someone ask me about the pregnancy or bring it up myself. I personally just feel bad about taking a job that I won't be working at very long. I would love to go back to the job after the baby is born and I'm all healed up. Just looking for opinions and personal experiences.