Fellow FTM to a now 5 day old.. trust me, your stomach will continue to grow! I looked pretty similar body wise to you pre-pregnancy and my bump ended up a decent amount larger this yours by 40 weeks! Everyone is different though! I was constantly told I had a very nice neat bump yet I felt like a whale! But i guess I did when I look back at photos! Having now had my baby, I can honestjy say every worry you have in pregnancy seems silly! I was worrying about what to wear in labour, what to wear in hospital, babies going home outfit etc. In the end, I wore a hospital gown as I had to have emergency surgery. My hair was washed and tied up out my face. I lived in my PJ's in hospital as I was too sore & tired to bother with anything else and baby came home in a plain white sleep suit from Sainsbury's as we were discharged at 11pm and she was screaming her head off as I couldn't feed her when she wanted!
My weight gain I complained about seems so insignificant compared to this tiny human I love ridiculously and who now consumes my whole day!
So I guess I'm saying just don't worry, it won't matter in 2 months time!