obgyn and sexually active

I had an appointment with my obgyn for a refill of birth control. My grandmother went with me since we had stuff to do afterwards. He was going to give me a pelvic exam and asked if I was sexually active (which I am) but I said no since my grandmother who is a very conservative person was in the room. He ended up not doing the exam, refilled my pills and said see you next year. I know i should've said something to him about being sexually active but I didn't. Should I just wait until next year to let him know?