I visited about a half a dozen websites and came up with these causes of false positive pregnancy test results:
- HCG shots for fertility treatment or weight loss (Pregnancy tests work by detecting HCG, the pregnancy hormone.)
- soaps or detergents (That is why pregnancy tests now have women urinate directly on the stick instead of urinating in a cup and submerging the stick in the cup.)
- Medications: anticonvulsives, Parkinson's disease medications, tranquilizers, certain diuretics, methadone, promethazine
- Trophoblastice tumors grown in a woman's reproductive system or germ cell tumors on the ovaries
- hysterical/ false pregnancy (which occurs when a woman wants a baby so badly that her body mimics the signs of pregnancy)
- Leaving the test for too long (It is very important that you follow the directions TO THE LETTER. If you leave a pregnancy test sitting for an hour and go back to check it, it WILL show positive.)
- uterine, breast, or ovarian cancer
- expired or defective pregnancy test
- evaporation lines (if the the positive line is barely visible)
- chemical pregnancy/ early miscarriage