I was working 4 days a week (as a midwife), studying two days a week which involved following up with other pg women as case studies. I was renovating our unit and I then moved houses. That was with my first pg. I finished up at 38 weeks.
Second pg I chased my toddler and worked 3 days a week and finished work at 37 weeks.
Third pg I had two kids, worked 3 days a week and finished work at 36 weeks.

Everyone is different though.