I worked up until 38 weeks (was trying to maximise my time off after the birth), but if I had to do it again I would have stopped around 36 weeks.Also as my waters broke on my due date I only had 2 weeks to chill out before my daughter arrived! Like you I didn't have any health issues , but as I was in the Nursery, I just found it very physically and mentally draining towards the end. Also as my maternity cover wasn't organised until the last minute, the last few days were particularly stressful. I would just say listen to your body. Your health and your baby's are what's important. Don't be like me and worry about inconveniencing school should you want to leave earlier than what you originally planned.