How To Eat Less

Since 1st and 2nd trimester I've been controlling my intake. Only over eating once in awhile. But ever since 3rd trimester, I eat SO much I'm so scared of my food intake... I try to eat smaller portion meal but I just keep on feeling hungry. As though I never ate at all. I'm gonna gain so much and affect my health. I really want to stop being so ravenous. Any experienced mummies with any similar experience and advice?