Could urine that have sperms in it, if left on the toilet seat and somehow come in contact with someone vagina cause pregnancy?

Here are some... Considering the high fastidious conditions for sperm survival, the described scenario would impossibly allow sperms to survive and move to reach your Fallopian tubes to fertilize a waiting egg at right time under right physiological setting. In fact, based on what I've known, no study has ever been designed and conducted to address your specific concern. So, your odd to conceive is likely zero...