Sayang, at 39w4d tu memang boleh jadi signs labour starting, tapi sakit menarik macam period cramps every 5 minutes boleh juga just Braxton Hicks or false labour, susah nak tahu from description je. Jangan tunggu, call your doctor or go to labour ward sekarang to check, they can confirm if it's real contractions or not, especially since you're past your original due date dah. A few of my mum friends had similar sensations dan turned out nothing yet, tapi better safe than sorry at this stage, kan?