Working while pregnant

I am 35 this is my second pregnancy (8+2) and I am starting to wonder if the majority of the pain I am experiencing is more related to my job than just being pregnant. I am a manager for McDonalds I work an 8 hour shift 5 days a week. Since i got pregnant it has been easier for me to get a 30 min break to eat and sit down. I am experiencing hip pain and lower back pain. Occasionally I also have a mild cramping feeling right next to my hips. I need to work as long as possible and dont want to start cutting my hours down yet. My owner said when I am ready just let them know. I try to stay hydrated at work but its not always easy.

Have any of you ladies worked in a restaurant while pregnant and if so what was your experience?