Pregnancy weight

I am eating the same amount I used to do before pregnancy. Yet I still gain weight. Tama ba na mag diet ako? Currently on my 7th month pregnancy. My OB keeps reminding me to lessen my rice.. In fact, I don't eat rice na during breakfast and/or lunch. Konting biscuit-biscuit nalang pag medjo gutom na talaga masyado or fruits na tama lang malamnan ang tiyan. one or half cup of rice nalang din kinakain ko pag dinner..