There isn’t enough evidence to say that any type of contraceptive pill leads to considerable weight gain. [popover id=ref2]
You may find that you put on a small amount of weight when you first start taking the pill, and this can be caused by the body retaining more water at certain points of your cycle than it would otherwise. But it isn’t normally very much weight, and it tends to go away once your body has adjusted to the pill after a few months