Hi there- firstly congrats on your pregnancy hun - hoping its a healthy and happy one for you!
I put on 6 kGS in the first trImester because I was nauseous and eating ALOT- I put on 15kgs all up so it did slow down and I lost the whole lot, 3 weeks after having her - I still have my jelly belly though so a bit of work to go!
Good luck!