Sayang, contraction dan sakit perut yang ngilu-ngilu at 38 weeks memang boleh jadi tanda awal, tapi kena check dengan doktor atau pergi labour ward sekarang juga untuk confirm, jangan tunggu lagi! A few of us mums went through the same worry, and honestly, checkup saja habis masa, better safe than sorry, especially dengan timing ni. The cramping + the back pain you're describing memang perlu professional assess, bukan guess-guess di rumah. Doktor pun dah monitor baby your size concern, so go in and let them check proper contractions, cervix opening semua. You're at that point where any change kena tanya directly to your doctor, not online juga, they know your full history! Lepas checkup nanti update lah. Sending you calm vibes!