When did you get a belly "growth spurt"

Still waiting for my belly to pop😂 im a petite person im only 5ft 2 and am 7 stone but im 20 weeks and 2 days and dying to have a big belly to show off! I know our babys growing perfectly but i hate this in between stage. I can feel my tummy starting to stretch as it seems every few weeks i get period like cramps, sharp pains back ache and itchy tummy. This is what i was like before i was pregnant and the second pic was last week.( it looks big in the pic but its smaller in person)