As per this article
7. Certain medical conditions
Rarely, certain medical conditions can cause a home pregnancy test to give a false positive. These include:
urinary tract infection
kidney disease that causes blood or white blood cells in the urine
ovarian cysts, particularly corpus luteum cysts
more serious diseases, such as ovarian cancer
pituitary problems (very rarely)
And if i may add, better na magpacheck up din just to be sure.
Pwede basahin full article here https://www.healthline.com/health/pregnancy/false-positive-pregnancy-test#chemical-pregnancy