Mum thinks I'm just getting fat 🤰

I'm 19+2 today and only about 5 people know me and my partner are expecting our second. I thought my parents just hadn't noticed (we see them regularly) but apparently they had noticed and my mum just thinks I'm getting fat! She's even mentioned dieting a few times! Do I just look fat or do I look pregnant? The photo I'm wearing black and white in is a few days old so I'm a little rounder now. I used to have an almost perfectly flat stomach.

I haven't told my parents I'm pregnant. The people that know I'm pregnant know because they either guessed or I had to tell them (one friend miscarried and I didn't want her to find out through other people, the other one I've told is because they kept trying to give me alcoholic drinks at a party so I eventually told them and they then got me a lemonade instead). We decided after having my son we wouldn't announce future pregnancies and just let people figure it out because we got sick of people's comments, I then miscarried before this pregnancy which makes me now terrified of telling people I'm pregnant because I don't want to have to let everyone know I've miscarried again if that were to happen. I'm really struggling with accepting my body right now, I'm showing a lot faster than I did with my son and I constantly feel like I just look fat. That's why I'm asking if I look fat or pregnant, my mum's comments really put me back in accepting my pregnant body again is all. I assumed she'd figure out I'm pregnant considering we see each other at least once a week and I'm suffering badly with PGP.