Yes, your wife's delayed period could indeed be a side effect of her medications. Specifically, risperidone is well-known for increasing a hormone called prolactin, which frequently leads to delayed or missed periods. Clofranil SR 75mg (Clomipramine) and fluvoxamine can also contribute to cycle irregularities. Regarding pregnancy, while consistent condom use and a negative test are highly reassuring, a test taken too early can occasionally yield a false negative. I recommend she repeat the home pregnancy test now for confirmation. If it remains negative, the delay is likely medication-related. Please consult her psychiatrist or gynaecologist to discuss these symptoms before making any changes to her treatment.