Sayang, at 38 weeks any abdominal pain needs checking out, jangan delay, go to the hospital or labour ward sekarang juga to be safe, okay? They'll check if it's contractions or something else, and at this stage better safe than sorry. A few of my mum friends went in thinking it's nothing and turned out labour sudah jalan or ada issues yang perlu monitor. Doctors will do a quick check and you'll have peace of mind. Don't worry lah, they see this all the time, just go get it checked out!