What's the weight gain plan again?

Monica • 36 yo, mother of 2
Can anyone tell me what's the weight gain normal plan- by trimester? I dont want to gain too much - im almost 12 weeks and have gained about one kilo, maybe 1.5 kg depending on the day, but if in the beginning i had bigger weight fluctuations, it seems that the 1.5kg is there to stay...and bring friends.