Ay, hindi ako expert sa ganyan kaya mas maganda talaga i-follow up mo yan with your OB, lalo na at malapit ka na sa due date, the amniotic fluid levels and placenta position ay importante para malaman ng doctor mo kung may kailangan i-adjust sa birth plan mo. A few of my mum friends nag-worry din about similar things pero lahat sila okay naman at nag-deliver normally, so don't stress too much, pero definitely mention it sa next check-up mo para peace of mind mo na talaga!