I know how you feel! I had multiple treatments, and had to wait for a month or two or even longer to begin treatments for various reasons, and was concerned as much as you are. I can't say for sure any had a negative impact, but beginning treatment as early as possible is best, I think, but sometimes it's unpreventable, and once something is removed like from surgery, can't be put back or radiation or chemo taken away once given. Once you start treatment, you will forget all about the wait, and will just wanting to get through each day.
Use this time to prepare, psych yourself up for the big fight. Good luck.