5 - 8 show poison ivy.

1 through 4 are not poison ivy; they don't have 3 leaves, they have 5.
Picture 5 is definitely poison ivy. I'd recognize that in my sleep (in my nightmares). Pictures 6 though 8 are probably too, though not the iconic nightmare image of it.
If you suspect that you have touched poison ivy or gotten its oil onto your clothing, shoes, tools, or pet, just make sure to wash the invisible oil off with soap or detergent within an hour or less. I am very susceptible to poison ivy, but if I wash it off with soap, I really don't get the rash. But think broadly about how the oil may have transferred from say, a pet or tools, to some other object. Wash them as soon as possible. Any soap or detergent that gets oil off works; no need for special soap.
Your poison ivy is small enough that you could actually pull it up, stuff it in a plastic bag and tie it off, then go immediately inside to wash your hands and gloves. I've done that to known poison ivy though I am really very sensitive to it.