not necessarily. It depends on whether your period is normal or not. If your period is 28 days or so, it is likely that your weight does not affect ovulation and will not reduce your chances of getting pregnant.
But women who are overweight or obese may experience some hormonal imbalances that can affect menstrual cycles and prevent ovulation, making it difficult to get pregnant.
For example, weight gain is closely related to a condition called PCOS. In this case, the ovaries do not produce enough hormones that stimulate the egg to mature or go to the uterus.