Ay, 56km daily commute na 20 weeks pregnant is really taxing sa katawan mo, sis, I'd honestly talk to your OB about this kasi bawat pregnancy ay different, and especially with that distance, need mo na makita if okay lang talaga for your specific situation. A few of us moms had long commutes during pregnancy, and ang common advice was to break it up kung kaya, mag-sit down as much as possible, at mag-hydrate ng maayos, pero really best talaga mag-check with your doctor para sa peace of mind mo.