Welcome to the Forum. Sorry to see you here, @Frances54 .... but you are at the best spot for good advice and a heap of support from those who've been there already.
Where abouts are you (City/state) - we may have members nearby who can point you to various resources available to you.
I was lucky & didn't have to do chemo ...... just surgery, rads & tabs for invasive lobular BC - but I was stage 2 ...... I can appreciate your concern & shock at chemo being put on the table as part of your treatment. Your health team will be making suggestions/decisions that they feel is the best for your long term health .... and the chemo is given as 'insurance' to mop up any 'randoms' that may have escaped ....
@kmakm may be able to help re genome test?
All the best with your ongoing treatment - be kind to yourself, accept the offer of any assistance along the way & take care xxx