Lendir putih tu normal during pregnancy, but sakit pinggang belah kiri kena check dengan doctor la, especially if it's persistent or getting worse, better safe than sorry! A few of my mum friends had similar worries during pregnancy and their doctors just did a quick scan to rule out anything serious, so don't worry, it's standard check-up je. Hormone changes memang sebabkan more vaginal discharge, tapi back pain boleh jadi banyak reasons, berat badan, posture, ligament stretching, so best to get it checked out proper.