I had use blended Talalay (around 70/30) on top over firm Dunlop underneath. Go for ~2–3″ Talalay + 6–8″ Dunlop, total 9–11″. Split firmness in a king is usually fine. Brands matter less than certifications (GOLS, Oeko-Tex). ILD should feel good to you. And yes, all-natural Talalay is safe during pregnancy.
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