I recently switched from using regular hormonal birth control to using progesterone only pills due to headaches. I missed a pill this week and was late taking the next day’s pill. The doctor has told me that unlike with regular hormonal birth control, you cannot make up a missed pill when taking POPs. They said we should be using backup method of protection when being intimate for up to 14 days. Is this permissible? And if so, what methods would be ok?