Doctor suggested low carb/Keto diet

So I went to the doctor last night since I have not yet had a period after my miscarriage in April. During my visit she mentioned that I need to lose some weight, I had gained 13 pounds since the miscarriage 😳 She suggested I do low carb or Keto. I'm hoping someone can help me a little with this, even if it's just a little help or a word of encouragement. I'm really down on myself over this weight and not entirely sure where to go for quality information. Thank you in advance!