Well they say in your 2nd trimester a lot of symptoms will go away and I'm 23 weeks but I have a little belly. You can only see him majorly when he decides to try and escape. I wouldn't worry too much
Its normal your just entering the honeymoon phase you will be showing soon but your going to glow then you will be in the third trimester with back pain and BH
it's normal for some pregnancy symptoms to go away in the second trimester and return again in the third trimester