Hindi pa yan sobrang laki, mama! At 36 weeks, normal lang na umabot na sila ng around 30cm or even bigger, yung baby mo ay nasa good track pa naman for that gestation. Pero honestly, the best person to ask is your OB kasi sila ang makikita ang actual measurements sa ultrasound and ma-assess kung healthy ang growth ng baby mo relative sa timeline mo, so basta i-update mo sila sa next checkup, okay? One of my mum friends was worried din about this during her third trimester kaya tinanong lang niya ng doctor, and mas natulog siya ng mahimbing after. You're doing great by monitoring, that's what good moms do!