Weigh gain

So I finally met the high risk doctor. They did an ultrasound and had me do more blood work 😩 (seriously itslike I should just have an iv in this whole pregnancy).. Anyways I have only gained about a pound in 12 weeks. I am not puking at all.. They didn't seem worried but I really don't want to be lectured in couple weeks that I am harming the baby 😩 so is it bad? I eat or at least try to eat three meals a day! Plus snacks... I have never been a really big person weigh wise always under...