Will your spouse get pregnant if sperm leak at the rim of the condom if she was on top?

It certainly can, and often does. Improperly-used condoms are a common cause of pregnancy. Condoms should be applied properly by rolling them down from the end of an erect penis, and the user should withdraw immediately after ejaculation, before his erection is lost. Further sex play can be done by hand. If further intercourse is contemplated, the penis should be washed and another condom applied. Condoms should never be re-used.

The technical term for people who fail to follow these precautions is "parents."