Girls, hi. 26 weeks, I've gained 10 kg during pregnancy. Is that norma…

Girls, hi. 26 weeks, I've gained 10 kg during pregnancy. Is that normal? I feel like a balloon, and my legs hurt, it's hard to walk. I'm thinking about a diet. I would like to know who and how they follow a diet in the third trimester, what can be done, and what not. Girls, please share your experience and knowledge. Otherwise, I feel like I'll explode.