Tests are valid until the next sexual act (not simply intercourse) and then they are void. If you're worried about it, getting tested is not going to change that. Don't fluid bond with partners that sleep around. Sure, condoms only protect so much but still, that's why it's called safer sex and not safe sex.
"Regret for the things we did can be tempered by time; it is the regret for the things we did not do that is inconsolable." - Sydney Smith
Kyle: 27 year old male
Katie (rymmare): 25 year old female
Kids: girl: 5 years old, boy: 3 years old