[ Pregnancy ] Open Question : I am 19 weeks pregnant. Between week 12 and 16 I only picked up less than?

1kg. But this morning when I got on the scale it said I picked up 4kg. (From week 16 - 19). How could this be? I do not want to pick up this much this quickly. I eat the same amounts as always. What can I do to help me pick up weight slower?