I just turn 18 weeks and is it normal that my pregnancy bump is still not showing?

Don’t worry mama, I’m week 18 as well and my tummy is still flat. Went for my check up last week, gynae said my baby was at the right size plus I lost 3kg in my first tri and have not gain any weight so far. But gynae does not require me to gain weight as of now because baby is at right size. As long as check up is okay, don’t worry too much :) some just take a longer time to show