Mommy, yan talaga ang important thing, na sinusundan mo ng malapit ang OB mo dahil alam niya ang full picture ng pregnancy mo. A few of us mums with twins noticed the same thing, na one baby tends to sit differently or bulge more than the other, but lagi siyang iba-iba per pregnancy, so really kailangan talaga ng doctor to monitor kung normal lang or may concern.
Your OB knows best kung bakit niya sinasabi ang 35 weeks, trust her on that, at follow every appointment. Fingers crossed for you na abutin kayo ng safe gestation for the twins! Kaya mo yan, mommy, you're doing great.