O wow lol

I was literally gonna post saying that I was feeling like I had stopped growing my belly because I do feel exhausted but I don't feel any bigger at all....I actually feel slightly smaller .... until I put these pictures side by side and to my surprise I do look a little bigger lol the first was at around 22 weeks and the second was today at exactly 26 weeks .....o and also random question....this app says I'm already in my third trimester today I thought that wasn't till next week ?????