Aww, sabar ye mama! Lepas 3cm bukaan tu memang boleh jadi macam tu, sometimes boleh cepat, sometimes labour ambil masa lama jugak, especially kalau contraction belum consistent. The on-and-off pain tu normal je, some of us mums experience that jugak before proper labour starts. Tapi since you're at 38 weeks and feeling weaker than usual, better you text or call your doctor/midwife today je to check in, they might want to monitor you closely, especially since your due date is coming up and you mentioned kena serah diri kalau tak bersalin. Don't worry lah, they'll advise what's best for you and baby. Rest up and stay hydrated!