You tell your gyn doctor just like you told us.....believe me, they have heard all kinds of questions and this will not phase them one bit. As the saysing goes, this is what they are paid the big bucks for!
Edited to add: If it makes you more comfortable, call the office and ask for the nurse, this way you don't have to ask the question face-to-face. The nurse will either be able to answer your question or suggest you make an appointment...either way, your question will be conveyed to your doctor.