Not Gaining weight

#pregnancy #advicepls #pleasehelp Hello All, I am about 14-15 weeks pregnant but I am unable gain weight. I was told to eat avocado and materna milk. But I don’t see any difference in me. I do see a small bump but my weight is about the same range from the start of pregnancy. Is this normal? Able to advice how to gain weight? I probably only gain 200-300g and then dropped. Initially had morning sickness but now not much of vomiting so is it still fine to not gain weight ?