Aww mama, congrats sa 31 weeks! Pero please see your OB agad, ha, hindi kami pwedeng mag-diagnose ng pain like that, at mas safe na marinig mo mismo from your doctor kung ano ang normal o hindi para sa stage mo. It could be round ligament pain or something else entirely, pero they're the best to check. Isa lang sa amin friends ang nag-experience ng similar, at it turned out to be pregnancy-related but her doctor just wanted to monitor, so don't worry too much, pero don't wait rin! Go to your clinic or ER if it gets worse or you have other symptoms, okay? Take care of yourself!