Hope you get some answers soon! I really would see a physio - that is their job! If you are in the uk you can ring up and make yourself an appointment, you don't have to go through your GP (physio direct, I think it's called). If you are in the US I know it's a different process, but it's got to be worth it to find out and give you some peace of mind. You're obviously worried about it, and although people on here can give you some advice, you need a professional to assess your knee and they will be able to tell you then and there. I know you promised yourself a year, but if you're concerned now at 9 months, I wouldn't leave it another 3 before getting it checked.
Any physio worth their salt can assess your knee in one session and reassure you as to what's going on.
Good luck and let me know how you get on!