Wa'alaikum assalam mama! Aku paham rasa risau, especially first baby kan, tapi honestly, discharge berubah masa hamil tu normal, especially closer to delivery, tapi since tu keluar macam selaput and you're worried, best call your doctor or midwife straightaway je, tak perlu tunggu, they can check and put your mind at ease dalam 5 minit je. Better safe than sorry, plus they know your full history! Keep monitoring kalau ada more discharge or any spotting/bleeding, but don't panic lagi, a few of my mum friends had similar things and turned out semua okay, just needed a quick check-up. Let me know apa kata doctor ya!