I'm postmenopausal so why is my urine test positive?

Beta hCG is associated with pregnancy and low elevations are common for women who have undergone menopause. — Wikimedia Commons

Elevated beta human chorionic gonadotropin (hCG) in postmenopausal women is an important finding, which frequently brings diagnostic uncertainty.

Whereas beta hCG has been historically associated with pregnancy, relatively low elevations are not uncommon for women who have undergone menopause.