Ay, that's quite stressful, mama, low amniotic fluid (oligohydramnios) is definitely something you need to discuss with your OB right away, hindi dapat na-wait pa. I haven't personally experienced it at 27 weeks, but a few of my mum friends who had similar concerns said their doctors closely monitored them with repeat ultrasounds and made sure baby was growing okay, so the good news is your doctor will have a plan. Kailangan mo talaga ng professional guidance on this one kasi it needs regular check-ups and close monitoring, don't stress yourself more, just book that appointment ASAP and let your doctor guide you step by step. Sending you strength, mamsh!