Ay, normal yan most of the time kasi lumalaki ang uterus mo at nag-stretch ang ligaments, lalo na sa 4 months na yan, pero kasi paminsan minsan lang siya, I'd really suggest checking with your OB to be safe, better ma-rule out kahit ano para sa peace of mind mo, nak! A few of us mums had the same worry at kinita lang ng doctor na ligament pain it was, pero iba-iba din kase ang pregnancy experience kaya best talaga if you get it checked. Sabi ng one of my friends, ang alam nila ay kung parang sharp or super severe ang pain, that's when you really need to go agad.