Bump Changes...anyone?

...I'm guessing I have extra space in there ...I really don't know how since I'm 5'1 & was originally 115lbs prepregnancy...I'm currently 117lbs &20weeks. At my last appointment my doc had to press down way up by my ribs to help the uterus come up 🤔 (If I understood correctly) Only then was she able to hear my baby's heartbeat...he was way back in there.

Anyways yesterday I felt so big..my stomach was rounder and I was experiencing some round ligament pain & felt like I would explode 😂(I'm thinking baby made his way up front) ...late that night I threw up for the first time in weeks (baby kept me up kicking,most of the night😩) & this morning I wake up and my stomach is smaller& flatter...I really do wonder how much space I have in there 😂 it seems unbelievable. Anyone else somewhat like this??