Ay, at 30 weeks parang normal lang yan na sobrang tigas ang tiyan, lalo na kapag gumagalaw ang baby, it's the Braxton Hicks contractions mixed with how tight everything gets na, pero if the pain is really intense or consistent, I'd check with your OB agad lang para sure, sis. A few of us na pregnant din dati nag-experience ng ganyan, pero importante talaga marinig ng doctor kung paano exactly ang pain mo, whether it's just tightness or something else na need intervention. Try resting, drinking lots of water, at if it feels worse or di nawala after a few hours, don't hesitate to message or call your doctor, okay? Mabuti na lang may OB ka na regular visits.