Boleh je, tapi kena hati-hati, best nya check dengan doctor dulu especially since this is your first baby, okay? A few of my mum friends did light hiking during pregnancy, tapi they made sure it's on easy trails, nearby hospitals, and with someone along, not too far from home in case ada anything. Main thing is listen to your body, kalau tired or dizzy, stop je, no need push yourself, and make sure you're drinking lots of water and taking frequent breaks.