Garden variety cancer treatment can kick in very quickly. High end topiary and any exotic variant takes time.
Genetic testing is a relatively new component, it does take a couple of weeks to get the results. Realistically, that extra time is not likely to be a major factor--unless, of course, it is. If there is any urgency, you will be informed.
Whatever is going on under your shirt didn't start yesterday, so there is every chance that the short wait to get a better idea about what is going on is well worth it. It sounds like you are getting the full gamut of tests, which is a good thing. Mxx