As healthy as possible, organic vegetables and fruits and all you learnt about healthy food.
A low-fat diet during pregnancy is not a good idea, for more complications may occur with such a diet.
Use only the healthy oils about which I wrote on my site. 2 to 3 spoons of oils per day are only healthy, and also nuts are high in fat. Pasta, cooked grains are all ok
Stay away from “make-ups”, etc. If you were never “instructed”, ask for a consult, a pregnancy is “too expensive” to be unaware of important issues!