BI Was Diagnosed With Breast Cancer, Had A Lumpectamy, 3

BI was diagnosed with breast cancer, had a lumpectamy, 3 lymph notes removed, radiation & chemo, now they say I need to get a shot of lupron 7. 5 once a month for 5 years and take a pill anastrazole for 10 years, Why, they never made no blood test to confirm I'm cancer free first. I don't want those shots.