There was a drop of semen on the front of the toilet seat,i wiped it off and wiped the entire toilet seat for to make sure,i saw none but what if i missed?,5 min later and a male used the bathroom to poop,then a female used it,could she get pregnant?

In the scenario you described, pregnancy is not in the cards. Here is some information regarding how one becomes pregnant: https://www.plannedparenthood.org/learn/pregnancy

Pregnancy is not possible in above circumstances. Contraception remains otherwise key in avoiding undesired pregnancy and associated anxiety and when intercourse is likely to occur.