How much weigh should you put on during pregnancy?

MrsO • 💕 Married 16/09/17 💕...🤰🏻Due December 2018 🤰🏻

I got weighted at 11 weeks and again and 26 weeks and I’ve put on 3.4kg in that time. The doctor never mentioned anything about weight but just wondering how much should you gain during pregnancy as a rough estimate? I’ve only put on weight on my stomach, I’ve put no weight on anywhere else so far!