Dr. Knopman said hormone changes while a woman is undergoing in vitro fertilization, or IVF, can also contribute to weight gain. "Oftentimes they will be taking gonadotropins, which are hormones that cause you to produce excess estrogen and then, after you ovulate, excess progesterone," she explained. And, she said, women can experience fluctuation in weight up to four or five pounds during an IVF cycle.
To learn more about IVF, head over to the CCRM website.