11 weeks first time mum

Hi! First time mum here. I'm currently 11 weeks. Haven't had my first ultrasound and my first appointment with NUH will only be in 3 weeks time. Feeling slightly anxious and paranoid about my baby as I've yet to see my baby via ultrasound. 😩 Is it normal to have the first ultrasound so late? Also, I'm gaining weight and I can't tell if I'm getting fatter or it's a baby bump 😂 how do you tell the difference? Previously I'm 49kg, standing at 154cm. Now I'm 53kg.