When to stop working

I am 38 weeks and 2 days and not dilated or showing signs of labor yet which makes me think I will be on time or late.  I live on Long Island and take a train and a subway to work - about an hour and a half commute each way. I had all intentions of next week being my last week of work but the forecast is 90-93 all week.  Do you think it would look bad if I requested to work from home next week? Or should I push myself? Just need some opinions from other pregnant ladies. Thanks!!