Whether you’ll gain or lose weight on Portia or any other birth control is a complicated question. Studies have shown that there’s no link between hormonal birth control and weight changes, but that’s mostly because it’s so difficult to prove that a medication is responsible when there are so many factors to consider.
In fact, you’ll probably still see both weight loss and weight gain on the list of birth control side effects, proving just how hard it is to predict and link weight changes to the treatment.