Does the progesterone only pill raise intracranial pressure? would it be safe to take with chiari malformation?

A relatively uncommon cause of pseudotumor cerebri is related to hormonal issues, but this is a complicated area and these situations should not be generalized. Your Chiari malformation if minor would have no symptomatic influences, and taking progesterone would not cause increased intracranial pressure. But since everyone is unique, discuss your misgivings with your doctor.