Need to vent but need opinions too!

I am 36 weeks, my energy is literally drained! My SIL has been asking for rides to her job, from her job, to her 2nd job, and back home from that job as well. We live in a busy city where traffic is an ALWAYS. Her first job is north while my hospital is South. She doesn’t know how to drive so my fear is that my baby is due anytime soon, and what if I go into labor or anything along those lines. She would be basically helpless, it’s making me stressed. How would I tell her/ my husband that I can no longer take her to work or pick her up. I want to stay at home and rest and prepare for my sons arrival especially since it’s my first child.