weight struggles

Danielle • Engaged to my best friend and first time mother to my precious boy x
I wondered if anyone could just offer an ear or some advice! I'm really struggling with weight in pregnancy. I used to be quite overweight, I lost it but have never been small. 
I keep finding myself being upset that I'm putting on weight (I'm nearly 12stone and I'm 5ft7- 25 weeks) and in an instant I'm worried that my belly isn't big enough and my boy isn't developing properly... does anyone else feel like this?