Listen to your body. If its telling you to slow down or stop do so.
When I was pregnant with my first I had planned to work up to 39 weeks. I was working retail at the time. At 35 weeks my body said enough. I finished the week then at 36 weeks was on mat-leave. It was a good thing I listened, 3 days into week 37, my water broke. So listen. you and the baby are number 1, your clients are not. They will understand ad if they don't not your problem.