Trish, I don't think you are over thinking as such. I had my biopsy in July, MRI in July & Bone Scan in August but I did not have my Brachytherapy until late January. So from diagnosis to treatment was almost 7 months. In hindsight I wish I had waited a little longer and taken a nice holiday before the implants. I was assured there was no rush as PC is slow growing and a few months would not make any difference. My PSA was 5.4, Gleason 3+4 and T2.
So take your time, get all the facts you need before making your decision as to what treatment to have and try not to worry too much, although I know that's easier said than done.
All the best whatever you decide
Alan