Ay normal yan, mommy! Around 4-5 months kasi lumalaki na talaga ang uterus mo and stretching nangyayari, so ang slight cramping or soreness around the belly button area is pretty common, a few of us mums felt the same thing din. The leg pain thing ay pwede ring ligament stretching or extra weight na, pero since it's moving around and parang arthritis type of pain, i-check mo na lang with your OB just to be safe, especially if it gets worse or mas malalaki ang area ng sakit, okay?