Hey mama! Totally normal yan, honestly, maraming mga kapatid ko na nakaranas ng ganyan around that stage. Yung abdominal pain sa sides ay usually ligament stretching lang (yung round ligaments na umuusbong with baby), and back pain often comes together kasi ang posture mo ay changing na and lahat ay shifting. As long as walang spotting, hindi mo kailangan mag-alala ng sobra, pero since ka-21 weeks ka pa lang at maingat ka, better to mention it sa OB mo next visit para ma-confirm na lahat ay okay lang, just to give yourself peace of mind. Naiintindihan ko ang overthinking, totoo yan! Pero alam mo, yung check-up talaga ang best reassurance.