Oo, totally normal yan sa pregnancy, lalo na around 13 weeks when your baby's growing and your body's making space! A few of us moms felt that sharp ribcage pain din, kaya alam ko kung gaano ka-uncomfortable. It usually gets better once you adjust your posture, use proper support, or try some gentle stretching, pero syempre if the pain gets really intense or doesn't ease, better check with your OB just to be sure, okay?