I am 14 weeks and am + 5kg too!! Half of what i gained in my 1st pregnancy so no prob!! Also expwcting twins this time !! Just try cutting out crap food and eat healthier , do a bit of walking and drink loads of water !!!
I should also add, my weight gain slowed down as soon as I started eating a ton more fruits and vegetables and drinking a lot of water
i second that first comment. look at what your eating because if your not getting enough protein in you definitely burn use up carbs alot faster because their easier to digest for your body then working to break down protein. so whenever you snack have protein with it like an apple with some cheese slices or peanut butter or almond butter (sugar free) granola with greek yogurt, veggies with hummus, hard boiled eggs are quick and easy (make a few one day and have them for the following days.) dont stress too much right now either its early and with all the hormonal chnages it can very well be alot of water retention. so reduce your salt intake and up the water. i try and get aboit 3liters in a day and i find on days i dont i can very well put on or retain about 2.5 kg of water weight. hope that helps but remember your body is doing something incredible right now and nature has a way of knowing what to do, so dont stress too much about the number. eat as well as you can and walk wherever you have the energy for it. :)
I gained like 10 lbs in the first trimester too, it slows down after week 13 though
I had to up my protein to keep me full longer. Choose healthier snacks also cause if you eat carby snacks it wont keep you full very long. I have gestational diabetes so now im on a low carb diet and I lost 10 pounds (of course I was overweight to begin with)... but for me more protien and less carbs have done the trick and I feel satisfied and less hungry.