Plus Size Mums *advice*

I am 7 weeks pregnant and have nausea and feel like i want to eat to get rid of the sickness feeling. I am eating healthy but have put on approx 2 kgs. I know i need limit weight gain throughout my pregnancy. I have read "most" women don't put on weight 1st trimester. I already feel uncomfortable and large what real advice can you give me... I am currently size 20/22 AU and about 105kgs. How did other plus size Mums go first few months? What did your doctors recommend?