Gaining 1kg every week

Hi mummies. I’m 6 weeks, and since week 4, I’ve gained 1kg each week. I’m not sure if it’s a healthy weight gain but I know for your first trimester, weight gain avg between 2-4kg is fine. But I’m alrdy up 2kg in 2 weeks. I’m afraid by week 12, I’m alrdy up 12kg. Any advise on how to keep the weight gain slow? I don’t snack but now tend to have a bigger appetite. Used to skip breakfast pre-pregnancy and now having oats/cereals in the morning. I exercise everyday too at least 45mins. My boobies are fuller and heavier, serious tummy bloating too.