Ohhh sakit rib pain in pregnancy memang biasa, especially second and third trimester, a few of my mum friends complained about this around 20 weeks jugak! Badan kita stretch dan baby grow, so ribs kita rasa pressure, plus hormones pun buat ligaments relax. Since ni first time you rasa, maybe best to mention to doctor at your next visit just to make sure semua okay je, tapi usually harmless, try adjusting posture, don't slouch, and maternity pillow memang membantu when sleeping. Hang in there, normally settle down after delivery!