Wa'alaikumassalam sis! Honestly, keputihan coklat cair at 38 weeks bolehlah jadi salah satu tanda labour yang coming, tapi since your first labour blur sikit, I'd really suggest confirm dengan your doctor or midwife, texting them a photo or calling them cepat-cepat je, because at this stage better safe than sorry lah. A few of my mum friends had similar discharge couple days before actual labour started, tapi ada jugak yang it's just normal pregnancy stuff, so don't stress too much yet but do check in with your healthcare team. Good luck, mama, you got this!