If i take two medications that are known to cause false-positive pregnancy test results, what are the chances of it causing me to receive a false-positive results ?

These are examples of meds that could potentially cause false positive pregnancy test results: Some anti-anxiety medications Antipsychotics Some antiseizure drugs Parkinson’s disease medications Diuretics (“water pills”) Antihistamines Methadone Antinausea medications

Never as high as being pregnant. If there is a chance that you are pregnant and you tested positive would recommend that you confirm or rule it out early and the best and easiest would be with your doc, your Gyn even better if having one.